Did them myself - not hard. I'd say 3 hours if you're taking your time. It helps to have an extra hand for the installation but I do it all solo. I use my floor jack to lift them into place until I get the main bolts in place.
You have to remove the plastic rocker trim first. It just pops off. You'll need to remove the small piece of plastic trim at the bottom of the front wheel well and trim it down. I used a body saw but you could use just about anything, even a sharp utility knife. Mark the line you want to cut with some painters tape to make it easy to follow. Leave the doors open when you lift the slider into place so they don't catch the weather seal at the bottom. Use some duct tape to hold the body bushings to the posts on the slider so they don't fall off before you get the bolts in. It also helps to have a long drift to poke up into the holes for alignment - could use a long screwdriver or whatever you have around.
If you're tentative, I'm home all weekend doing prep work on my LR3. You're welcome to come by my place and I'll help. I think you're in Sac, right? I'm south of you in Walnut Grove.
(Correction - I see you're in Alameda. you're still welcome to come by but it's a bit more of a drive. I might actually be able to stop by your place one night next week if you'd like since I'll be in Oakland a couple nights anyway)