I just want to emphasize to be careful with direction changes or with circles that you don’t cut across the path of anyone who is jumping. Again, when schooling in the show ring (if a ring is open for schooling) be very careful about jumping diagonal lines and also when changing direction. Try to pay attention to what other people in the warm up ring are doing. If someone is having trouble with a horse, stay well out of their way, don’t assume that they have it under control. Give kids/ponies and obviously green horses extra room and consideration. You will never go wrong with a “heads up jump X,” “coming up on your left” or “rail please.” And, always be prepared to simply pull up, add an extra circle, etc. to make sure someone is out of your way.
Definitely do your training at home and have a focused warmup plan. It helps to have done a flatwork warmup earlier that am so you can be more focused on warming up rather than schooling prior to your class. However, if you are inexperienced riding in busy rings, don’t allow yourself to feel rushed. You might need to wait a sec for a gap in traffic to get to your jump or to change direction.
Don’t get hung up on the left shoulder to left shoulder passing rule. It often doesn’t work in the schooling ring. If you are turning to get to a jump or circling you may need to be on the inside track. Just call out what side you are going to if it isn’t obvious.