The bolts should not be rusted. Are you using the torx? The first time I did mine, the drain plug broke. Take off the top fill hole first and make sure that comes out before you drain and can't refill. I can't remember why mine broke, but I think it had something to do with a washer not being there maybe. Use a torque wrench and do them right.
Also, you will need a hand pup for fluid. I got mine at Advance Auto for like ten bucks. You can screw it right onto the qt or gallon bottle and pump away. It is impossible to fill without something like that. The trucks need to be running and gears shifted thru. It would help to have all wheels on ramps a few extra inches to work with. The exhaust gets hot quick. Also, chock the wheels front and rear and have a friend help shift thru the gears.
Get the gallon of fluid as it is much easier to keep pumping from. If you are using the Lucas, mix it well into the regular fluid. It is very thick and will jam up the hand pump.

 

Broke 3 of mine taking them off. Couldn't tap them out. Just drilled new holes next to them :P. Works great right now, but well see how long that lasts.

 

I just changed mine yesterday. 01, Disco

There are six 10 mm bolts that are attached to little aluminum spacers

Put a little penetrating oil on the bolts if they are rusty

Remove the drain plug 5mm allen

Drain the fluid

Remove the six 10mm bolts only one is a little hard to get

Take a rag and clean the metal shavings off the magnet

Wipe out the pan

Put the drain plug back in

Pour a bottle of that Lucas Trans Additive directly in the pan

Remove the 3 tork screws holding the filter on to the valve body

Be mindfull of the "o rings" (dont forget to replace both)

Transfer the "snorkel" (plastic pick up pipe) to the new filter.

Put the new gasket on the pan

Put the pan back on to the valve body

Make sure the gasket isnt twisted by visually inspecting the perimeter

Pump in a coulpe more quarts of Dexron 3 Atf in the filler hole

Start the vehicle (make sure it's level)

Hold your foot on the brake and run it through all gears a couple of times

Leave it running in Park

Get underneath and keep pumping in the ATF until its starts flowing out the filler hole.

Quick put the filler plug in and torque it to fifteen lbs

Spray the whole thing off with brake cleaner

Watch it for a while with the motor running checking for leaks

Your done

On a scale of one to ten regarding difficulty this job is a 2

The most important thing is that motor has to be running and hot when you finish topping it off.

 

thanks for the sizes Boston