After you have set everything on the ground, throws, or dual rates if you want, whatever.....now you go fly....have a bud stand out there with you in case the trims are off bad enough you can have help trimming while you fly the plane......1st order of business is fly the plane...2nd order of business is trim the plane....I trim at 1/2 throttle or a tad above half....I trim the surface that is giving me the most problems first....bottom line is with no wind you trim the plane to fly straight and level thumbs off the sticks
Good Luck