It is NOT a difficult job to do. No need to remove the spring at all.
Remove the cross brace, unbolt the guide rod bushing bracket and unscrew the rod counting the number of turns.
Take the four cap screws loose from the bracket's cover and tap the old bushing out with a mallet. Compress the new one with a large hose clamp to assist inserting it into the bracket. Reassemble and reinstall the bracket on the car counting the same number of turns of the rod you counted when removing it. Easy.
This is my brief version off the top... Rough, long day here so I hope it makes sense. I have pics posted here somewhere you may find during a search.
Make sure the car is safely supported before you get under it.
Good luck.