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The coil is mounted on top of the spark plug , you need a 5/16 or 8mm socket and extension with a 1/4 inch ratchet.
Unplug the wires to the coil you want to change remove the hold down bolt, And sneak the coil out from under the fuel rail. Installation is reverse procedure.
What is the problem is it too tight?? if it is too tight warm up the engine first and this should allow you to take it right out.
If it is another problem please post back and i will do my best to help you out.
No the light has to be shut off with a scanner. All the coils are interchangeable,But I would take the truck for a ride first and see if the plug may be slightly fowled maybe it will clear it up by it self. Also if the garage scanned the engine and told you it was #6 missing that came from the scanner and it can pick up a miss you can't even feel.
I am getting conflicting info about clearing codes on book says you need a scanner another says you can do it by disconnecting the battery for 10 seconds.
Be careful disconnecting the battery you might need a code for your radio anti theft it equiped
The fuel pump will not set the light but you have a code in there if the light comes on get it read and post back I will try to help you get to the bottom of this.
Autozone stores will read the codes for you free.