1996 isuzu rodeo 5spd 3.2 4x4

Pretty sure I need a new clutch. Month or 2 ago, this noise started, only when you weren't pushing in the clutch, a kind of hum. Then first gear started to hum a bit, got a little worse and so on. Now the tranny hums like a mofo in 1st 2nd 3rd, not really 4th that i can tell, and maybe a little of 5th.

I believe the problem is the throwout bearing, but id need to replace the entire clutch anyway. Is this the case?

Called Autozone to check prices on clutch kits, guy said there is 2 types of trannys and ill need to see which I have, but he gave me the prices on both, on was like 280 the other 380 or so. How do I tell which one I have? Are these prices good? Should I check anywhere else (suggestions)?

What do I need to do to remove, or better yet drop the tranny enough to put in the new clutch kit? Remove driveshaft, the shifters, what else?

Finally a few other questions. Myself and a friend of mine would be doing the labor, I dont have a job right now and I trust myself with the work more than a shop.
How long do you think it will take, bright and early am to dark?
How can I tell how much longer until my clutch shits out on me?
What driving style should I practice to get the longest time left on this clutch? Shift at about 2k or so? I know take it easy, and since 4th gear seems the safest should I just try to shoot for that gear and cruise, rather than 3rd?

Thanks guys, this isnt the first time ive asked for help here, wont be the last!