If you have never used or seen magnetic polish it's super easy to use. I put on 1 coat, let it dry then put on another coat. Immediately after painting the second coat on a nail I held the magnet over it for about 15 seconds. Super easy and fast!
Also, I wanted to mention....I love the magnet Nails Inc. is using on their magnetic polish. It is by far the most user friendly of the 4 brands I have tried (Layla, LCN & Essence are the other 3). It has a lip that you put where your cuticle is so you don't end up hitting your nail with the magnet. I put a picture of it at the end of the post so you can see what I'm talking about.
Nails Inc. magnetic polishes are available on Sephora.com and in Sephora stores, they are pricey at $16 each but I really love them! If you can only get one brand of magnetic polish I'd pick this one solely because of how easy the magnet is to use.