I would like to look at an aspect of starting a business that isn't often considered. Mostly discussions are about finance, marketing, recruiting a great team, VAT, legals and all of the other stuff of start ups. But most people need the support of family, friends, and partners. Start ups are hard, and you must be sure that everyone is with you, everyone is supporting you, and everyone understands what you are doing.
My decision to start a new business was made jointly with my wife. Although she's had limited involvement in the management, she was a full participant in the original decision. And as a result, she has supported me in every up and down since then, which has been a real help. Similarly, my sister and a friend both lent me money when we had an early cash flow crisis. They wouldn't have done this if they hadn't been taken on the journey beforehand.
And that's the rub. If people close to you aren't with you, they may be a source of discouragement. In the extreme, broken relationships can greatly increase the chance of business failure. I've actually seen this with a friend, where they ultimately ended up with nothing. On the other hand, constant encouragement and reassurance can be a real help – as can financial support.
If you start a business, it won't only affect you, it will impact those close to you as well. They deserve to be told what that will involve and to be consulted for their opinions. Do this, and you will increase your chances of success significantly.