If you use E-6000 you can quite easily (with effort but without destruction) take things apart if you feel you need to redo them. For example if your biceps turn out to be too large in circumference.
Marking out cuts with a pencil first helps while you are thinking things through. And don't worry too much, almost anything can be saved. And make a build thread to document, ask questions and it also helps the rest of us here give you pointers at each step, but also warn you if you are about to make a mistake.