Ok - first thing to do is STOP!
First principles of messing about with cars/engines/anything that might go bang and take your house with it:
Buy the right manual that covers the equipment.
Read the manual section on what you want to achieve from beginning to end - eg Haynes manual section on removing the injection pump (you were, at least, right about that) and make sure you understand what's involved and that you've got the right tools (or substitutes) to hand.
Once you've done that - have a bloody good look at it in situ, BEFORE you pick up any tools. Find all the bits that the manual mentions.
Then decide if you're up to doing the job - if you think you can't because there's something you don't understand in the manual, or there's something the manual mentions that you can't find/see - ask for advice at this point and then make your decision.
FWIW, Haynes rate this as a 'four spanner' job - ordinarily that means don't go near it, even with someone elses, unless you're a pretty competent home mechanic with a pretty comprehensive tool kit. As you're not going to be refitting it, it's an easier task.
It should go like this:
Disconnect the throttle cable and wiring from the stop solenoid.
Remove the fuel and fuel return lines from the pump - if they're still fitted on your engine as it's out of the car.
Remove the injector lines from the pump and from the injectors.
Remove the three securing nuts holding the pump on and then 'withdraw' the pump towards the bulkhead end of the engine.
If it sticks at this point, I'm a bit stuck on how to advise you - CharlesY might have a better idea.