no problem at all, we all started at that point sometime in the past.
you can only check the extractor-play, when disassembling the slide completely. check youtube for some detailed description, there are plenty of good videos there.
the extractor should have a little play and fall out of the slide just by gravity, when the firing pin safety is pushed manually. if not, the extractor might have some negative influence on your extraction and your brass to head problem.