I would say take it slow until you got the hang of it. Everybody has their own way of going about it; I like to drill deep enough to get the magnets flush to hide gaps and make it look natural. These magnets are super small so I like to put a super small amount of paint on the outside edges so I always know what direction they have to face. I also recently got one of these to help glue and paint but I am not sure how I feel about it yet. If you never magnetized anything before it might be worth it to shoot over to ebay and pick out some 40k Space marine bits so you can practice on something. Should be able to get a complete mini for a few dollars and their limbs have a bit more girth to it.