Starting a business isn\u2019t easy, and starting a successful one is even harder. So where to start? One good way is to listen to those who broke through. We talked to some of the world\u2019s hottest startups right now and they are nearly unanimous: You\u2019ll probably fail before you succeed. Turning a great idea into a viable business model will rarely be a linear path, and if you aren\u2019t ready to work harder than you ever thought you could, you\u2019re probably in the wrong business. The entrepreneurs sharing their insights were all finalists in a $1 million search to find this year\u2019s best social enterprise. The prize was won by Change Please, a London-based coffee company that trains homeless people as baristas and gives them work so they can leave the streets. Change Please also won an unexpected partnership with musician and tech entrepreneur Will.i.am, who will be helping to establish the business in the U.S. next year. Here are their stories, and they share advice in the video above. Eyal Yassky, Israel, Hilico The business: A portable, patent-pending device makes the most of the world\u2019s most readily available resource: rain. It collects rainwater using a leaf-like tarpaulin and filters it twice, before storing it in expandable jerry cans. The entrepreneur: Co-founder Yassky was a disaster-relief responder when the idea came to him. He never intended to start a business, he simply created a product he needed. After recruiting an engineer from his home in Israel to help, Yassky realized their product had a market. \u201cWe realized very quickly that the way the world is going, you need a company to purchase a product from. Starting an NGO may bring us to a solution but there won\u2019t be any market for it, and we wouldn\u2019t have the reach needed to actually solve the problem. So we decided to start the company.\u201d Diana Yousef, U.S., Change: Water Labs The business: A toilet called the iThrone, that works without water or pipes and is designed to provide sanitation access for everyone. The entrepreneur: Yousef, formerly a consultant for NASA, was researching how human waste in the space station could be repurposed back into usable water. She was inspired by the idea of using breathable materials as a way to passively purify water, but her focus wasn\u2019t in space. The business began after the arrival of her first daughter. \u201cI\u2019m a mother of two young girls, and I started this venture as a way to resurrect my career after it stalled out after having my first child. This is the reality for many amazing and smart women, we get sidelined, career-wise, once we have kids. After experiencing this personally, I wanted to show that I could reinvent myself.\u201d Pawel Soluch, Poland, Neuro Device The business: A headset that uses electric stimulation to help improve rehabilitation for people with speech disorders. The product is in the final stage of its clinical trial, and Soluch hopes it it will be on the market about a year from now. The entrepreneur: Soluch worked for seven years at a university hospital in the neurosurgery department. \u201cI met a lot of patients with disabilities regarding movement, sensations, verbal difficulties and I saw there was a big problem. Aphasia is a disability where the intellect is intact, so they have consciousness, they know exactly what they want to say but cannot say it.\u201d Francesco Pezzuoli, Italy, LiMiX The business: LiMiX\u2019s flagship project is Talking Hands, a glove-like device that translates LIS (Italian sign language) into speech. It gives deaf people a voice by translating sign language into spoken word using using a voice synthesizer on a smartphone. The entrepreneur: Francesco Pezzuoli and fellow student Dario Corona devised Talking Hands at a startup workshop in October 2014. Their professors encouraged them to take the concept further. After fine-tuning the prototype and gaining investors, they created LiMiX. Cemal Ezel, U.K., Change Please The business: Change Please trains homeless people as baristas and employs them to run its mobile and permanent coffee outlets. Within 10 days of working with Change Please these once-homeless individuals are found housing, given a bank account and paid the national living wage. Change Please won the Chivas Venture $1 million competition and have also landed a contract with Transport for London (TfL) to operate in rail stations. The entrepreneur: Cemal Ezel, named Lloyds Bank social entrepreneur of the year in 2017, set up Change Please after working in finance and seeing homeless people every day. \u201cI constantly saw individuals holding out a coffee cup looking for spare change and asked myself how can I flip this on its head. Change Please was born.\u201d Instead of shying away from a homeless person, Ezel said he\u2019d help.