You will need a way to lift the car so the springs can come down a bit. Space is tight and the bushings will be tough to get out, as well as getting the new ones in. A lift with center lifts would be ideal IMO. If you don't have a lift you will need to be very careful, it's not as easy as it seems at first. Use dish soap to help install the new bushings. Perhaps use a smaller bolt that is longer, (long enough to capture the new bushings prior to them being fully seated), with some washers and nut to act as a clamp which will draw the new bushings in. Tighten the bolt until the bushings are close to fully seated then install the new bolt to finish the job. I have never attempted this job without a lift so again, be careful if you don't plan on useing one. I'm certain you will have a hard time without the ability to move the springs around with ease. I removed the rear end from the springs completely because I installed new springs as well which allowed me to move the springs independently.