Judging "clinics" or "seminars" can only do so much. I've judged with some memorable folks like (a FT with) Loren Morehouse (who I haven't seen since) and Jack Jagoda (who many people have a grude against, but who knows dogs AND people - and deserves some of the crap he gets...)
If you're really into dogs, training, handling, ... you're half way there. Watch the people!
Some of the best handler/trainers make HORRIBLE judges. A FEW people who don't do much traininig/handling make good judges. Different skill set.
Give it a try.