Fuel filter 87 CRX

Slowly doing a tune up on an 87 crx si. Bought a fuel filter and went to install it(its a different filter thean the one in the car... seems honda has changed a few part specs or something). Anyway, i've gotten as far as the service bolt to relive the pressure, so, how do continue disconnect the filter? Another question I have is a relatively benign one, got a spark plug that seems to have been tightened a little too much.. should I leave it alone, or try and break the seal so to speak and risk stripping the threads?
Any ideas would be greatly appreciated.

the filter you should be able to go ahead and change just make sure you marke the in fule line and the out fule line as for the spark plug now that it is in leave it till next change if you back it out now the crush washer will be no good .....