Make sure you do a search, there are many good threads on this topic here.
I have done 4 sets myself without an assistant. The biggest challenge is getting the the bolts out because of rust. Thats a new can of worms and there are several ways to resolve it. You will have to loosen all of them so that there is enough play in the cradle to remove the upper bushing, work from side to side. What I mean is loosen all the bolts a bit and then loosen both drivers side a bit more, then do the front drivers side and then the rear, something like that. Then you can do one corner at a time like you suggested. The poly bushings fit tight. You need to reuse the metal from the old bushings and clean them up really well. Then getting the upper bushing in is a challenge. Grease it up good and make sure you don't tear them getting them in. Poly is tough but not indestructible. Car on good jack stands is a must and two floor jacks is better than one.
Good luck, post up with more questions
I'm on my 11th LH Car!
2010 F150 FX4 34k
2004 Impala LS 64K
1997 Intrepid Silver 3.3 186k
1997 Intrepid Sport 3.5 FranknTrep 212K/160K Engine
1995 Intrepid Red 3.5L 108K
1995 Vision TSi 87K
1996 Intrepid Teal 3.3L 69K
1970 GTX 512CI