I've been wanting to start anodizing for a few months. The main "secret" tips seem to be not over-anodizing it (won't accept dye), clean & etching it (better dye retention & less bloches), and sealing it via steam instead of submerging. The people that have tested DIY setups claim there is no difference between an adjustable lab PSU and an old PC PSU, just make sure it's 12-15v and can supply enough amps.
Re-anodizing is more complicated, especially for parts with machined tolerances. Stripping can use the same stuff as the etching process, but you need to keep an eye on it. Partially stripped parts obviously won't accept dye in various spots, over-etched may remove too much material.
One interesting thing with it being winter soon, anodizing tends to grow thicker/harder coatings when the bath is a lower temp.