Originally posted by: svi
It's usually pretty easy, maybe even more so than it is with a desktop. Usually there's a removable panel in the base that covers the DIMM area, and you just unscrew that to add or remove memory modules.
If you're buying any major-OEM-branded machine, I'd recommend going with the lowest amount of memory they offer and upgrading the laptop's memory yourself. As you noted, they charge far too much for additional memory.