Valve Cover, Serpentine Belt, & High Press Pwr Steering Hose?'s

[jEster]

Looks like our '04 X5 needs some more TLC. After it's last service, the dealership advised us that the valve cover gasket and high pressure steering hose were leaking, and the belt needed replacing. Obviously money is an increasing concern, and what they want to charge seems a bit more than I wanna pay. But I haven't done much work on BMW's and want to know if taking on these repairs is above my abilities. I am a fairly competent shade tree mechanic with a decent set of tools, so have any of you guys done any of these? My biggest concern is the gasket, not sure what all needs to be pulled to get at the valve cover. Also where do you guys get your parts? AutoZone is the closest physical parts place by me, and their site says they can get the parts, just not sure if they are quality replacements for Beemers...

Oh and what kind of time should I carve out to get this done, can't have the wife's ride out of commission too long...

Thanks for the help!