Basic, old school works just as well as gadgets. I'm a tech geek, but you may find a lot of that stuff stays in the drawer. The one gadget I find handy is a Robart incidence meter, but still not a must-have item. When measuring CG, I put some trim tape (or a magic marker) on the manufacturer's recommended CG, then have a ready reference during the final build phase.
We had a member show up with an Aeroworks 1/4-scale Extra to maiden. He hadn't checked the Cg, so I downloaded the manual on my phone and we used a tape measure to mark the spot on each wing. It was assembled, so another member and I used our Mk1-A fingertips to lift the plane. It was spot-on, which was reassuring. After all that, we had to wait an hour to maiden it. Seems he forgot to fully charge the battery lol.
Good luck, have fun and Happy New Year!