I too had to learn to fly on my own. If you must, you must. Your success depends on a number of factors. First, you must have a high wing trainer plane that is light. Many are not. The heavy ones must fly at unnecessarily high throttle just to stay in the air. Fast means the beginner is always behind the plane. Your concentration can't keep up with the plane.

Next, you must have very good throttle control so that you can throttle back to cruising speed reliably, so that the engine will keep running.

Next, it helps if you have no restriction as to whether you can fly behind your flight line. If you can fly around yourself safely, and this depends on your flying site, just fly circles around yourself to the left. Left is always easier. Take off with full throttle but as soon as you get say, 50 ft up, throttle back to half. A lot of this depends on whether the airplane is trimmed out properly. You do know what that is don't you? Plus, depending on the design, you may have to add more downthrust,,, most trainers don't have enough.

If you need to observe flight line rules, you can get disoriented too easily when the aircraft is coming toward you. In that case, turn your body and point the antenna in the direction that the plane is going. Look over your shoulder if you have to. Keep the plane in sight but always point the antenna in the direction the plane is traveling.

Finally, don't do it if you can avoid it in the least. Many clubs can be intimidating but if you hang around with your plane a few times, hopefully, someone in the club will approach you and offer to help. If not SHAME on them.

Or, get or practice on a flight simulator. A shame to need to do this,, they ain't cheap.

PS

Learning by flying left with no flight line is a bad habit you will need to unlearn when you do fly at any club field. Still it may keep your plane in one piece for the initial number of flights. When you have left flying and left-handed approaches mastered, be sure to learn all over agin to the right. Thereafter, do all your flying as though there were a flight line.