Just make sure the screen you are going to buy is compatible with your laptop, they aren't all, even if they are the same size.
Replacing screens isn't difficult, but take your time. Dell is actually good in that they post instructions for most models on their website.
From my experience with Dells, lay the screen back all the way (flat in other words if you can), then you have to pop the backplate above the keyboard (probably from the left, twisting slightly as you move to the right), then pop the hinge covers, carefully pull out the 2 mounting screws next to the hinges, this will release the top part of the laptop, then remove the corner rubber guards and remove the bezel screws under them, then CAREFULLY remove the bezel, which snaps along the sides. Once you have it exposdes, carefully remove the mounting screws along the sides of the screen, lift the old screen carefully, disconnect the LCD
from the electronics bundle (i want to call it a modulator, cause thats what it is), and if needed the power supply as well, the screen should now be loose, put it aside safely.
2 notes, the plug you need to pull for the LCD
is normally wide and flat and near the TOP of the screen, the circuit board you need to keep so it's not the fat wider plug that attaches to it. Also have the Battery out of the laptop when doing this, not so much for your safety as to keep from accidentally frying something with an errant screw.
Putting in the new screen is the same in reverse basically, just don't overtighten the screws and be careful with the plastic pieces going back in, especially the backplate as if it isn't in right the buttons bind/wont work.
Otherwise, I'm still using a 3 year old Toshiba... works fine for almost everything, even run Vista when i want it too, though it was an upper-level machine at the time with real graphics and 2 GB
of RAM. Replaced the screen and HDD (twice grrr, stupid Seagate drive) in it. Everything else works fine.
Also one tip, BEFORE you order a screen, get the Dell part number and google it, there might be a non-dell branded replacement that's identical. For the larger rez screens, Dell tends to use Samsung LCDs, so if you can find it as a generic Samsung it's probably 100 or more cheaper. I've done this for Dell, Compaq and Toshiba, just read everything CAREFULLY before you buy, and if ordering it by mail INSURE THE SHIPMENT!
Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety.