Remember the arc of the rocket a long distances...The Allied sniper house is Donner is a good example of this. If your shooting the rocket from Axis sniper house, you want to aim above the window your shooting at. It's called rocket sniping.....Rather effective if you can learn to do it AND you can get rid of those snipers who slaughter teams from there.
Have your secondary on quickswitch. Switch between both with 'q'. It's very handy.
Hmm...While I'm dishing out tips, rockets can get easy kills in tight spaces, i.e. Stairs, alleys, and hallways make the rocket great fun.