Come on, you can do it yourself!

It's not that difficult, it just requires a methodical approach and patience. Make only one adjustment at a time so that you can see the effects. Don't change wing AND stab. incidence at the same time for example. After a while you'll be able to fly someone elses plane and tell them what adjustments to make. The more planes you fly and trim, the more experience you'll get. I'm actually kind of new at this (Matt is a seasoned expert) but I am an Engineer so I guess that helps. Even with all the "science" there still is a little bit of a "black art" aspect though. Just don't be afraid of that. You'll do fine.
Matt made a good point. Most modern Pattern planes do behave in very similar ways. Aside from inherent coupling issues, the trimming process is pretty much the same. I normally set my planes up with .5 - 1 degree of downthrust, .5 degrees positive in the iwng and 0 on the stab. Fly and adjust from there. Usually it only takes a little adjustment on the wing incidence and sometimes a minor C.G. re-location. Mixing is the last thing you do and most of the time you don't need to do too much of that if you've done everything else correctly. If you find that you have a lot of mixes, you should either disable them all and try to trim the plane mechanically or find another plane. Modern Pattern planes require very little mixing. Scale and 3D planes can present more of a challenge. That's what I meant by different planes requiring different setup and trimming details.
John Pavlick
Team Black Magic, Tech-Aero Designs