I did my own engine replacement (02 with the bad 6th cylinder sleeve) at 96K miles. One of the easiest things I've ever done. The only suggestion I have is that you have the fuel line tool to disconnect the fittings, have your freon removed at a shop, and when trying to get to the top bolts of the bellhousing, have the driveshaft(s) removed, support the transmission with a jack, remove the cross member for the transmission, but leave the engine mounts attacked. The whole assembly will pivot down and give you great access to the top bolts on the bellhousing. Remove only the top couple, leaving the others, put it all back in line and properly supported before removing the rest. The whole job took me less than 12 hours with little help from anyone else. Oh, you do need a swivel, and about 18-24" of extensions for your socket to reach those bolts. Without all the EGR, almost no vacuum lines, and a very simple wiring harness, it has been my most favorite difficult job. I've done spark plug changes on V-6 transverse engines that were more frustrating that this. Just take your time and all will go well.
It should also go without saying that our engine is REALLY long. You must remove the hood to get clearance to take it out, and despite being made of aluminum, is very heavy and cumbersome to deal with on a lift.
Good luck!