The biggest help I can offer you is to get a friend or mate to be there with you.
Walk through what you want them to do with the trim tabs as you try to keep the plane in the air.
Have them hugging you with there hands over yours ready to move the trim tabs.
When the plane gets in the air, you give commands while they are trying to follow them and you moving the TX all around.
When you get the trim close, then you may be able to take it from there but that is going to be your biggest issue.