Practice makes perfect and while some people excel with seemingly little effort, you can be good at something nonetheless. You don't have to be a master mechanic to perform routine maintenance on your bicycle, I just finished stripping my old bike down and assembling those components onto a new frame with little experience. What worked for me was understanding how the parts worked instead of just following instructions so maybe that will help you going forward. I remember the first bars I wrapped looked pretty sloppy but now I feel happy with how they look once I'm done. Good luck!