HOW DO I CHANGE THE FUEL FILTER ON MY 2002 GMC YUKON XL I AM HAVING TROUBLE DISCONNECTING THE HOSE END

First - Safety is always the key to working with fuel:
1) Remove from the area of work anything that could ignite the fuel, 'High intensity shop lights, no smoking'
2) Work with a flash light or directional battery operated light if its dark.

Two tools to have in my opinion -
1) Pliers
2) Needle nose

1st - use the pliers to spin/break the hose end loose over the In and out flang of the fuel filter.

2nd - If you have a needle nose pliers which have a very narrow nose end.
Place the nose end all the way at the hose end that's over the fuel filter's intake/output flange.
You then can leverage the hose off by forcing the body of the needle nose up against the body of the filter.
Just like a teeter totter where the body of the filter becomes the /\ fulcrum of the teeter totter.
Hope this makes sense?
Blessings,
A/V Media Guy