Not much prior knowledge is required before starting. According to Dell, however, you must have the following tools:
"#0 and #1 magnetized Phillips-head screwdrivers
Small flat-blade screwdriver
5-mm socket wrench
7-mm socket wrench
Small plastic scribe"
(Guide found at: http://tim.id.au/laptops/dell/latitude%2...)
Flip laptop over.
Remove the screws over the RAM door
Open the RAM door.
Carefully pull the tabs over the RAM chip down - the RAM will spring up.
Remove the RAM from the socket and insert replacement RAM.