The install is the same for the tacos(nonTRD) and the tundras. What kind of locker were you planning on installing? Lock Right, EZ Lockers are the easiest and cheapest to install. ARB and Detroit are the most expensive.
I'd suggest the Powertrax No-slip. It's the same as the Lockright Locker except, it's a bit more street friendly but cost about $100 more.
For the lockright locker, powertrax, or EZ Locker; if you do the install yourself, be sure to get new outer axle seals and o-rings. Cheap and easy change while you have the shafts out. If you have a shop do it, expect to pay about $300-$400 for labor.