900 billion screws
Once you tear it down completely and rebuild a few times it get's a lot easier. Still not as ideal for quick racing changes as the tmaxx or other horizontal chassis trucks...but not too bad.
You can pull out the whole engine with just a few screws. Shocks and wheels are no problem. The only pain would be to change out the center driveshafts or maybe a differential or shock tower.
Change all the screws to hex head and get a nice set of hex wrenches and that should help.