some newbie brazing tips:

in no specific order:
use as big a tip as you've the nerve to. don't be bashful with
the heat. practice on many, many old lugs n' tube offcuts.
learn to lug braze w brassrather than silver; it will help your
hand-eye coordination because the color spectrum is different.
afterwards, silver brazing will seem more logical. try brazing
while you are high or mildly alcohol-induced. (try this as an
exercise, not on a frame you plan to sell). try fearing your
materials and tasks less. be less analytical.