First, be prepared for alot of gas, and get a container to drain it into.
There will be 2 thick tubes that run from the rear underside of the tank to the metal fuel rail above the throttle bodies on the engine. Those are the fuel lines which connect to the tank by small connectors. Check to see if the connectors are metal or plastic. Since this is the first time you have done this, don't be suprised to find plastic connectors, colored red and white i think. You may have to replace these after you remove the fuel lines. they are extremely fragile and probably will crack. just another reason to buy some upgrades

Along with the two thick tubes there will be 2(?) thin tubes that are simply vacuum lines attached to the tank near the fuel lines, just some gentle pulling will get those off.