That's what spotters are for. Your gym should have a staff on hand to help you if you don't feel comfortable with one of the patrons helping.
Form ALWAYS matters. The danger of doing heavy weights on the 45 degree leg press is contracture. (lower back pain) Don't let that scare you, just make sure you are doing it correctly.
Let me recommend a book to you- "Strength Training Anatomy" by Delavier. It's an illustrated guide on various resistance exercises. Get it. You won't regret it.
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