Yes, I understand it. It isn’t a show you can just start watching randomly in the middle of a season. You have to have started watching from the beginning or from the beginning of season 2. (I started with the beginning of season 2 and saw season 1 on DVD later).
Since then, I’ve seen every episode of Seasons 2–5 twice. I don’t want to brag but I know pretty much everything there is to know about Lost. I should be able to answer any Lost-related question you might have. :)
This site also really helps me when I find myself confused or wanting more info: www.lostpedia.com