Need Starter Motor Advice

[Neil Vonhof]

Starter is becoming troublesome. It engages the the flywheel just fine when
cold (after an overnight cool off)- every time, always starts. But when warm
it usually takes 3 or 4 tries before the starter engages the flywheel enough
to finally start it up. When is fails to engage, the starter motor spins up
to high RPM but the gear doesn't grab and turn the engine. Sometimes it'll
grab and begin to spin the engine but then disengage before the engine is
turned enough to start. So far repeated attemps always result in success,
but it's getting worse and it's certainly becoming more & more bothersome so
it's time for......what? A rebuild, total replacement?
Any BTDT on removing and installing the starter would be helpful. Is it
relatively easy if you can raise the car enough to get under it? Any sources
for new/rebuilt motor would be really helpful also.
TIA,

Neil Vonhof
Seattle, WA
1991 200q20 Sedan  150,000 miles
Glacier Blue, V-8 Taillights
Borbet 15" 5 spoke wheels, Bridgestone Potenza RE 950's
K&N Air Filter