Hi I'm returning to model rocketry after a 50 year absence. I've recently introduced my grandson to the hobby and so far we've put together a variety of low power rockets and one medium power rocket (Super Big Bertha). I made a lot of mistakes assembling Super Big Bertha but I was able to work through them and learn a few lessons along the way. Next I plan to make some low and medium power DIY rockets and work my way carefully toward high power. No rush. I have more mistakes to make I'm sure. Cheers!