I did ball joints and a wheel hub in 5 hours. After pulling my shoulder the 500 seems cheap, if your quote included the ball joints.
You will need a 15 mm socket to remove the caliper bracket and the wheel hub. A small pit arm puller or BFH for the tie rod end.
Basicaly its like doing a brake job plus pulling the tie rod end, then 4 bolts for the hub. (breaker bar will be needed) Im not sure what is needed for the explorer hub nut, IIRC the torque is well over 100 ftlbs.
I used an impact on the wheel hub do to the tight space in there plus i had one handy.
I have done it in the driveway with out such things two. Took about 2 hours but I have a PVH truck and need to learn how to remove that damn orange snap ring.
99 x-cab 4x4 4.0l auto
mods, cranked t-bars, silencer delete, k&n drop in, Rebuilt trans ,Trans Go stage 3 shift kit, 3200stall Fuddle Racing Torque Converter,
VANIR 63mm TB, Roush split rear exit exhuast, E-Fan, JBA Headers
Auto up/down both windows, OHC, EATC (soon to be modded)
03 Crown Victoria Police Interceptor