Posted 08 November 2010 - 04:06 PM
It is very hard to judge what is complicated or simple with so little information on how much you know about it, and how much experience you have on the subject (even though you've made some upgrades before).
As far as I can read from your post, you might be better off taking the tower to a shop and get them to do it for you.
I'm assuming you already have the RAM sticks to upgrade the machine, so these guys shouldn't charge you much (if anything at all!).
I don't know how things work in the US, but a RAM upgrade when the customer has the RAM already would probably cost you about $15 or could even be free, like I have done so many times for so many customers over here.
It's up to you of course, but if you're not that comfortable with it, then it might be a good idea to exercise caution.
Good luck with it
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"...if ever I have made any valuable discoveries, it has been owing more to patient attention than any other talent..." (1642-1727, Isaac Newton)