When presenting your business plan to an angel investor you must understand that they will be very interested in your spreadsheets and proformas, but you must also realize that it is typically an entrepreneurial optimistic approach, which causes problems with proformas. Therefore, you should have dueling spreadsheets; that is to say the spreadsheets, which take your best guess and double the time, double the expenses to compete with your optimistic approach. You should be able to present both of these to your Angel Investor; who chances are is a retired business person with a little bit of financial savvy.
Thirdly, you can start use a spreadsheet program to schedule your time or organise all kinds of stuffs. You can use it to un-clutter you life by having different checklist on spreadsheets. After you learn the basics of spreadsheet programs, you can come up with more creative ways to use it in your daily life. You can even use a spreadsheet program to assist your weight loss plan. Use it to record your daily food intakes and you weight.