3. Do Chin-ups. Start with Chin-ups. Once you can do 5 reps with proper technique switch to Pull-ups.
This is basically what I plan to do to get to pullups. I used to have a doorframe chin-up bar at home and before it broke while I was using it once and I fell on my ass I was able to do about 6-8 chinups.
I've always had a lot of trouble training my upper back. Until now I usually only use the lat pulldown machine and get stuck at around 80-90lbs. From what I've been reading lately the problem might be that the lat pulldown machine is totally useless.
My gym has an assisted dip/chin/pullup machine but I've never seen it unoccupied for more than 30 seconds at a time so I haven't even bothered trying to get in line to use it. I think I'll just work on chins until I can rep out a dozen of them then try switching to pullups. If I still can't do one pullup by then, I'll jump and do negatives or something.