No problem. I assume you are trying to do this job with the engine in the car. First, let's do the seal. I will assume that you have a fresh new seal to put in place. Knock back the lock tab segments of the seal retainer. Now take a very narrow chisel, or even a screwdriver and work it between the seal and the engine backplate by tapping on it with a very small ball pien hammer. You need to be careful here so that you don't mar the crankshaft or the backplate,mostly the crankshaft. You'll find that you will eventually begin to distort the seal, at which point you can pry it out of the backplate. Of course, you'll want to observe just how deeply the seal is "planted" in the backplate so that you can judge how far to push the new part in before refitting the retainer and bolts. Sometimes the crankshaft has gotten a pronounced groove worn around its circumference from lots of miles, revolutions, and dirty oil. This will reduce the effective tension of the seal. If you're very careful, you can find a different depth at which to install the seal to give it fresh "land" to seal against. The spigot bush is another matter.
In fact, you may want to do the bushing first. It's messy. You need to find or make a shaft of wood or plastic (nylon or delrin are ideal). This shaft should be eight to ten inches long and needs to fit snugly but not extremely tightly into the spigot bush. (unfortunately, the plastic pilot tool that comes with a new clutch doesn't fit well enough and isn't up to the beating) O.K., now get some very heavy duty grease. Fill the bushing hole and all the space behind it with the grease. Leave no air. Finally, insert the shaft or dowel you have found or created into the bush a short distance. You shouldn't be able to get the dowel in very far if you have gotten a good fit. Now grab the biggest hammer you've got and whack the end of the shaft a good shot. In some cases the bushing will pop out on the first hit. What you have created is a displacement pump with the shaft as a piston. Something has to give. It's usually the bushing. Sometimes you have to keep banging away for a bit. I have only had this method fail once. The bushing has been loctited in place. The shaft itself gave up. I'll bet this isn't the case with your car. Give it a go. You may want to drape a wiper rag over the work as you hammer on it. It WILL spew grease, but when that bushing jumps out, you'll laugh. I guarantee it.
From Lola to Land Rover, If it's British and has wheels, it's likely I've bloodied me knuckles thereupon