[serjester]

As an anecdotal counterpoint of the 10ish people that I knew that started lifting in their teens and early twenties not a single one had a trainer. Preventing injuries through proper form is the main benefit of a trainer and everyone stayed fairly injury free.

You don't need to hire someone to explain good nutrition, sleep, etc. Does it help? Absolutely. But necessary? No. There's so much amazing content on the internet. Especially when you see how little training the average personal trainer is required to undergo. Someone truly competent will run you close a $100 an hour.