I ask because I am level 19, have done all the quests up to Sanctum Cay, and am still missing 42 primary class skills and 41 secondary class skills. I have skill points (though in ignorance I spent a few early on) and am due a few more from missions before the end of the game. I'm sure I'll also get a few more freebies before the end, and a few more from 'levelling' after level 20.
But there's no way I'll scrape enough to get all the skills and switch profession and get more. Am I missing something, or do people just ignore a lot of the skills they can learn when spending scarce skill points?