You'll need to remove some vacuum lines and things before you can remove the valve cover. These will likely be brittle and crack, so it would be wise to have new ones ready. Also there's the PCV valve & the rubber grommet in the valve cover the PCV valve sits in. That grommet usually crumbles when messed with, and is best removed/replaced while the valve cover is removed. See picture below for part numbers:
The grommet (Dorman part shown above) is available at almost any auto parts store and is usually hanging on the "HELP" rack. There are also the 3 metal/rubber washers that help seal the valve cover around the mounting studs. These might come with the valve cover gasket (depending on where you get), but if not ask for them and they will have them (these are very common and used on many Toyota engines). Tim
PS: I looked at your link and it looks to me like the gasket you purchased comes with the metal/rubber washers.