time for winter repairs and maintenence

[Orlando]

76 v20 cuddywith a 78 175 johnny, i figure its time to do some repairs i been putting off because they will be time consuming. i purchased the boat beginning of last summer and was more interested in using then fixing. Projects i plan on doing this winter:

Install lowrance elite 5 fishfinder and chartplotter i got for x-mas
install new cdi coils, plugs and wires
Replace head gaskets, diverters, thermostats,and impeller
Rebuild carbs
Pull and clean saddlebag gas tanks
Rewire the rats nest under the dash
Rebuild fuel pumps
replace every frigging fuel/vent hose on the boat
relocate fuel vents
Install 15hp nissan kicker motor

this is the list i can think of at the moment. I have a quick question for you guys, im sure i will have more as i proceed with these projects. Question number one is how hard is it to remove fuel tanks and clean them out good? looking for tips or previous "ah s***" moments so i know what to watch for. Thanks guys