AC repair compressor change out

OK ac clutch failed, still cools just can,t hear over the bad clutch noise, removed belt, so I purchased a new compressor set up with drier and expansion valve, questions is how hard is it to get to the expansion valve and should I flush system and change expansion valve or just flush all lines I can get to and leave expansion valve alone? I know you can not flush through the expansion valve. Need AC live in FL.
95 GEO metro, 214000 miles, 5 speed, 1 Liter

Has to be taken to a professional anyway, might as well ask him these questions. Any time the system is opened you need to pull a vacuum on it before recharging, not to mention reclaiming the old juice.

I have a spare used clutch I can sell if you want to eliminate the hassel of changing out the compressor. You said it still cools right?

Thanks, Ron

New clutch was 85.00, new complete compressor, dryer and expansion value was only 150.00 delivered to my door, sorry have a complete new system now but thanks, need a compressor for that clutch?