Don't mount your charging jack/on-off switch on the same side of the fuse as the muffler.

Don't obsess with getting everything perfect. Do the best you can in a reasonable amount of time then after learning from your mistakes move on to the next one.

Pay lots of attention to pushrod/radio installation before you even begin to build the fuse or wing. Most kits have the pushrod installation instructions in the very back of the book and leave their installation mostly up to the builder. You don't want to be trying to make cutouts in fuselage formers or add bracing after the fuse has been sheeted. Look ahead!!!!

Sand as you go. Do not wait until everything has been glued together to start thinking about shaping balsa.

Fuel proof the fuel tank/radio compartment before sheeting over the top while it's still easy to get to.