Holding TX: Correct way... there really isn't one. Do what feels best. Popular way: In the states probably hand held with thumbs, in Europe, TX in tray with finger tips on sticks, but it really doesn't matter. Don't believe the hype about better pilots don't use thumbs. Many world class pilots use thumbs. Just look closely at pictures of TOC pilots, many are flying with thumbs and they are the best of the best. Then again, many world class pilots use TX trays and fly with finger tips... My point: It really doesn't matter.

Gotta watch those neck straps and antennae. I've seen straps sucked into props taking the TX with them... not pretty. Be careful about keeping the strap around your neck when starting engines... don't want to lean over the prop and get sucked in. I typically leave the strap attached to the TX, but fold the strap under the TX such that it is not loose. This works for me, but do what you need to do to be safe.