Dealing with screws, bolts etc
 

I am trying to perform several tasks that all seem to end up the same --
stymied by a rusted, stripped, immobile screw, bolt, or connector. (My car
is a 99, driven eight winters on salt-laden streets.)

The latest is the retaining screw that holds the air tube on the throttle
body which won't budge no matter what I've tried. If I could get it off,
I'd like to remove and clean the throttle body but I have no idea what
obstacles that will present. I'm also trying to get to the IACV which is
way behind the throttle. The one screw I can see looks rusty to me, and I'm
put off by attacking the ones I can't see. I also need to remove the
distributor and expect to find similar obstacles in that job.

Any advice, tricks, tips etc. for dealing with these energy-sapping
obstacles would be appreciated. Thanks.