I'm asked all the time on how difficult it is to install one. I have done a bunch and don't find it to be that difficult, but I had a little learning curve in the beginning as well.
I've not been asked to do one that I couldn't do as of yet anyway.
I buy my tails for use on the bows I build and also for resale. I too buy from Abe as well(nice guy, just don't tell him I told you that). They are impossible to find in quantity or quality anywhere else. They are also the finest bow grip on the earth and in a pinch, you can use them to pack mudd into a damb.
BigJim