Hey Tin Bender, and welcom to the wrold of RC Trucking. I am new myself but having lots of fun learning!
The standard motor that comes with the Tamiya kits is very fast. To slow my trucks down you can eiuther use a reduction gearbox (Check out
http://www.gardentrucking.com/produc...=10&startAt=51 or a slower motor, I have got a few of the carson puller motors without the gearbox, can be found at
http://www.ebay.com.au/itm/Carson-Tr...item2ec3672522
Start seraching the net and eBay, as well as this forum to find more info.
Ifg you arer worried about your skills driving, I very much suggest putting animal guards (Bull Bars) on your trucks, I have got them on all fourn of my trucks and with many a late night and can in the shed, these things save me a lot of repair works!!
Enjoy and keep posting, check this out to give you some inspiration:
https://www.youtube.com/watch?v=wX1aA40c4F0
Welcome and enjoy!