Windshield replacement

When we purchased our Aztec, one of the things that we promised to
update/upgrade/replace was the two piece windshield with a new 1/4" one
piece. This will raise our compass up and move our OAT gauge to the pilot's
side window.

Well, today it came and is sitting in my computer room. I've got the STC
and the install directions so next week when the Azzy goes in for it's
annual, with the help of our A&P/I we'll take out the old and put in the
new.

The install directions look pretty straight forward. Remove the old, trim
centerpost for remounting compass, clean out the old seal and silicone, test
fit, trim, test fit, trim, ect. Install new seal, silicone, remount
compass, swing compass, mount OAT in side window. Use plastic cutting drill
bits, 100% silicone caulk, new hardware, ect. Yeah, I'm "sure" it will be
that easy... not.

So, does the group have any collective wisdom, horror stories or vast
experience replacing windshields?

Thanks!
Jim