Few folks realize just how tough it is to fly one of these RC planes until they try it. I've known some cocky young dudes that drive the RC cars/trucks tell me they could do it first time without a hitch. So,,,, hook up the buddy cord and let's see you do it brother "I would say." Needless to go on with this story ,,,,, those of you that are RC pilots know what happens.
Trainer gets the plane turned and onto a straight pattern down the flight line at 6 mistakes high. Flips the trainer switch/button and calls " YOU GOT IT NOW." Plane starts getting the newbie over-reaction handling and here comes your first turn. Plane heads for ground. Trainer releases the switch and calls.. "I GOT IT."
The story above pretty much describes every first flight I've ever witnessed including my own several years ago.
There are a few exceptions nowadays with computer flight simulators being the number one reason for success. But without that,, and with no trainer to help you ,,, there are just too many factors that will make your plane's first flight,,, it's last.
Trimming the control surfaces. Maiden flights are all about trim and timing. Sometimes we get lucky with our build and do such a good job that little if any trim is needed. This is rare. And I've never ran a tank of fuel on the ground to check flight duration and had it be the same once I started flying .
Trust us Charlie. We all went through the process. My instructor was a tough, mean , strict type who made me try things before I thought I was ready. Will never forget the first time he killed the motor and called "DEADSTICK !" "What ya gonna do now?"
My fourth flight was in 20mph winds. He said,,, "The wind is our friend." Crummy friend if ya ask me. Crosswinds really ache.
But my first solo from takeoff to landing hooked me and I've never looked back. And that old Hobbico MKII trainer .40 was still in one piece long after I quit flying it and moved onto more advanced planes. I then sold it to another who was just starting out.

I hope you'll find a local pilot who will give a little of his or her time to help you get started the right way.