Impossible decisions!

I am spending more time trying decide than I am sewing! I am so frustrated. Everytime I think I am certain about a design I start hesitating and I don't want to cut fabric and really get into it if I'm not 100%! The worst part is when you are trying something new so you are not clear how the patterns are going to come together, adjustments, etc. Any advice at this point would be welcome - in the mean time, I will continue to work on the undergarments.