Yes the plugs do break in two or three pieces on these models. that is normal you just have to have the right tools for the job and no, do not go to the dealer. There are other shops in town that can do the job for half what the dealer will charge. Remember the dealers have to charge for the big signs in the front and for the CEO's vacations!
While normally a spark plug replacement is an easy process, you can open a can of worms with this job. This is something that you want to leave for a Ford specialty shop or to the dealership. The spark plugs are commonly breaking into the cylinder head and it's very difficult to remove them. Ford had to develop special removal tools to have the job done without removing the cylinder heads. Just do a search on Google. I have one suggestion, a week or two before you take your truck to get the plugs replaced buy 2 cans of BG 44K cleaner and add them to a full tank of Shell premium fuel. It will help to remove carbon deposit from the combustion chamber and makes the plug removal a lot easier. It will makes a big difference.