20v TB, replace myself?

["David B. Kase Jr." <desmo888@mindspring.com>]

Sick of my endless questions? Well here is another...
Should I replace the TB myself?  I am mechanically inclined (I fixed
airplanes for 7 years, I better be) but maybe the job is better done by a pro.
I like the idea of doing it myself and taking extra time to clean
everything well and not taking any short cuts. I also want to do a complete
job as listed on the 20v page.  Replace the water pump and seals.  
Anyone try a 20v TB out there?  I plan to buy the Bentley but I thought I
could get some real life feedback.
Thanks,
Dave Kase
deposit on a 90Q 20v  :)