I did the plugs on my 05 Expy last year, with about 100K miles on them. Prior to starting, I read everything I could find about the subject and pre-purchased the Lisle removal tool. I took my time doing the job, and in total took me 7-8 hours spread out over two days. I did the soaking thing, cracking 1/4 turn, soaking again and let sit overnight. I tried both impact wrench and socket wrench. In the end I still broke two plugs, one with each method. Thankfully both were near the front of the engine. Lisle tool worked perfectly though. Worst part of the job was being hunched over the engine compartment for that many hours...killed my back! Good luck in getting them out.
