I may be Canadas Worst Handyman, but yesterday was able to install MinnKota Terrova trolling motor bracket and motor, move batteries from back to front compartment, upgrade to 24 volt system with battery trays, minnkota circuit braker, as well as 2 bank charger. Ran wiring through conduit by attaching old 12 volt wiring and pulling through. Ended up working out well!!
Last year installed my Lowrance HDS system myself. Was a little more tricky attaching power lines to fuse ( under driver console, but had problems at all.
You can do it!!