Never underestimate the value of a good gym trainer. They are there to help not only their own clients but other gym members that ask. Especially if you're new to lifting, hiring a trainer will help to make you more confident in performing your exercises. Some gyms will give you free sessions when you sign a membership contract. See if it works for you.
I can't speak too highly of the four trainers we have at our local Y. It's been fun trying to get stronger with their help. Today one of them gave me some very helpful advice on how to do neutral grip pull ups correctly. He told me, then he showed me, then he videoed me, and finally he critiqued me. He really knows his stuff.
A good trainer is absolutely a Godsend. Thank you, Jordan!