Just a quick question, I'll be changing out my heater core on a 96 blazer 2wd this weekend, i've been reading other peoples tidbits. is it roughly the same instructions for other models such as the 95 or 97 perhaps??

Yes it should be close.
And figure all weekend.
It is a 8-12 hr job flat rate time.
Look around in the how to section.
If you do not find anything there a good factory repair manual or a all data sub would be a big help.
Good Luck
MT

http://www.alldata.com/products/diy/index.html