Make sure you're shaving with the grain and not against it, and also that you're not going over each area more than once (twice, at the most). I shave after I shower and with hot water, so my skin is loose and open. I moisturize after shaving as well, and while I do occasionally get zits as a result, they tend to be minor and easily dealt with. I just make sure that I change my razors frequently and that I'm shaving while my skin is in optimal condition for it (e.g. warm and loose).