The only way you can tell if its over tightened is check the gap in the tensioner after you finish the install... There is a limit in how far the pin pushes in the tensioner and its only supposed to be gapped so much. Check out a manual and it will tell you. VFAQ also has some nice Tbelt steps and info.
Ive done my tbelt a few times and you definetly need the right tools including guage for the tensioner unless you use the factory bolt that releases the tension. I just took it off and used a vise. After a couple times its cake but the first is the worst. Ive had to take it all apart once right after I did an install becuase the balance shaft spun around the wrong way and it looked lined up but it wasnt. -Terrible shaking comes from that.
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