If your caliper piston is sticking, it can give you that clunking noise. I had to replace my passenger front caliper last year. Clutch and pressure plate is very simple on these, but in my experience it is easier to pull the engine than the transmission, especially if it's 4wd. I can have my engine unhooked, out, back in and running after about 4hrs (several years of old gen subaru wrenching lol). You will need an alignment tool for the clutch you can get about anywhere for $20 and the 2wd and 4wd clutches are different with different splines.