Sleep Associations

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We have been ferberizing for the last few days and I have read thousands of posts, books, sites etc on the subject. Nighttime is definitely improving but naps are still a major issue. I'm sure the problem is that DS has never napped in his crib, just rnp or swing etc. So maybe he doesn't associate crib with naps just night sleep. Anyone have any advice on what worked for them? Do I work on nights and worry about naps later? Or just keep trying. Poor thing needs to sleep so I give him the amount of time to try and then I just end up giving up for that period and he falls asleep somewhere else. Its just making for a very cranky baby when he is normally my little ray of sunshine.