Cool to see more musicians wanting to build their own stuff! I think most of the problems I had with my first builds were lack of technique for soldering and assembling.
We used to make our own PCBs back in Chile, and that increased exponentially the chances of screwing something up in the beginning.
Kits are the way to go I think!
Learning how to read capacitors values (I made a list and checked it back then) and using a multimeter in the beginning for reading resistors' values.
The rest is just patience and perseverance... If I had given up the first 5 times (on a row) that my first pedal attempts failed, I probably wouldn't be here

.
That and careful soldering should get you going!
Cheers!
Doug.