First thing that popped into my head was why? Has the finish bubbled or started to peel? Or maybe you just don't like the color and want to change it?
Varnish/lacquer does not guarantee that a pipe will smoke bad or hot,and removing it is no guarantee that the pipe will smoke better.There have been literally millions of varnished pipes made and are still being made. The majority are good smoking pipes.
Having said that,I don't like lacquer/varnish either! I smoke mainly "drug store" pipes,mostly estates bought on Ebag. I love restoring these old pipes but when I get one I leave the lacquer on-if it's in good shape. If not I remove it. I cannot tell ANY difference in the way they smoke.
Like Unclearthur said,don't be surprised at what you find under that finish.The reason for that finish is to hide fills and sanding marks etc. and to make it shine without a lot of sanding and buffing like the high dollar pipes get when they are made.
As far as break in,well most would disagree with the way I do it. I just fill it-to the rim- and smoke it. No problems yet!