Not a hard DIY job for all 3 of them. Start in the morning, done in the afternoon. While at it, you can actually take a look at quite some other areas and fix whatever looks funny. You also end up with fresh coolant and new ATF in the PS system, which isn't a bad thing. What you can check are the accessory belt, pulleys, coolant system, sparkplugs (read them).
P.S: what shop did you use?