Cost for timing chain service

I may purchase a 1994 2.4L truck (190K miles) and the owner is not sure whether the previous owner has had the chain serviced, and the current owner has not.

1. Should I just look for another truck?
2. If I do buy it, I would attempt to service the chain myself. What is the overall cost to do this oneself? I would probably to the water pump while I'm in there as well.
3. I have changed brakes, mufflers, and water pumps, how difficult is the timing chain service?

If you do it yourself, parts are under $100, unless you need to replace the TC cover too.
Definetly replace the water and even oil pumps while you're in there.

Here's a great step-by-step how to.

http://www.4x4wire.com/toyota/maintenance/timingchain/

The timing chain job isnt that bad, its just time consuming.

If the the timing guides are worn or bad then it needs to be done..

It took me two 12 hour days my first time. Could do it much faster now...

My prior experiance on the 22re motor was limited to doing the oil pump and water pump...

Cost me bout $200 for a timing chain kit with new cover from engnbldr.com and new rad hoses and such...