I just finished the job of which you speak. My timing belt had just over 90k on it. But the motivation to change it was the weeping waterpump. I had to add coolant about once a week. The belt looked like it could go another 90k. Likewise with the Idler/tensioner rollers. IMHO, you should leisurely shop on Ebay for the parts you will likely replace: Belt, Idler roller, tensioner roller, waterpump, distributor caps/rotors. I spent about $200 for all of the above. Then wait for the waterpump to leak. If you just can't wait, then dive in when you have the time. I did mine over three days, about 4 hours per day. Caution! There are some glaring omissions in the tutorials on this site. Nothing a decent do-it-yourselfer can't figure out, but it will slow you down occasionally. If I had the time, and a camera I didn't care about, I would do a followup tutorial.
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