What is the best way to change sparkplugs on 5.4 leader ford engine?

What is the best way to change sparkplugs on 5.4 leader ford engine?

If they're stuck, you must follow the procedure in the Ford service bulletin to avoid damaging the head. If they're not stuck, remove and replace them like you would any other plug.

Had you bothered to give us year and model we could have given you more info.

The tool for broken ones is available online for like 60 bucks.

If you use the special foaming cleaner and follow the bulletin St Paul mentioned, They don't have to break.

If you goto the ford garage it's not your fault, so if they break it bad, it won't cost full price.
Owner loyalty and a TSB fix can lead to goodwill by the MFR.