Do you really mean paint? or are you referring to stain? Personally, I won't even try to remove paint, unless its to prep for re-painting. Way too difficult and, around here at least, too few willing to pay for it.
Assuming you're stripping something that can actually be stripped, work with the grain, feathering in and out. I like a 45* tip, but the key to not fuzzing the wood is controlling your chems and pressure. Use the lowest pressure possible, let the chems do the work and neutralize.
Back and forth across the grain CAN be useful in removing scars left by - hopefully - others.
(My experience and suggestions relate to pressure treated wood. I rarely ever see anything else.)