The new intel mac mini is not supposed to be user-upgradable because apple has everything packed up so tight in there now but that hasn't stopped many people from opening it up anyways. I, for one, upgraded my mac mini myself to 2gb of ram and didn't find it too difficult. If you dont feel very tech savvy then i would go ahead and take it to a apple specialist and have them install the ram for you. If you are going to install it yourself there are many DIY videos out on the web that can really help first timers.
Cheers,
Danny