As another senior - I feel your pain!!! I feel the same way some of the time but don't give up. Even when it turns out different then what we planned, it still looks pretty good. I decided since I had the time, to go slower, measure twice as they say, then take what I get and make 'lemonade' out of it.
I've noticed that the longer I am retired, the less self-confidence I have and I'm determined to get passed that.