As others have noted caution, I would too. The upgrades are usually pretty stable but (no offense) as a newbie to the Mac I would watch the boards and see how others do with the bleeding edge of technology.
I would however buy a copy from Amazon now and save the $20 and get it without any shipping costs (just specify the longest delivery time) and perhaps when it gets in you can determine whether there have been any problems that you should worry about.
I ordered it from Amazon and when it comes in I will load it up on one of our three Macs and check it out.
My experience is that upgrading the Mac OS is much simpler and worry free than upgrading Windows. So, when you do upgrade, follow the instructions closely (they are simple) but my experience is that some former Windows users make it complicated and do things that goof up the process (no offense - I just have had some experiences where I would ask folks who have called me in a panic - why did you do that? and the answer is always is that is what we do on the windows side. Dont ask what ... I don't remember)
buy it now, save some $, get it perhaps in a week and then wait a week.
good luck (oh, yeah, welcome)