OK, I found more posts on the archive, seems to really be a pain in the %&%$#% to remove the starter... I still have some questions:

when exactly is the starter solenoid supposed to click? (is it when the key is turned to the on position just before cranking it?)

if I manage to get the starter out, how can I know if the starter is bad? (I know I'll have to test the unit connecting the small and big leads, but will I know if the teeth are broken or grinded on the starter or on the flywheel?)

Thanks!