Yes, create a group containing those users. Good job on the research, keep it up. You can deny that group access at the workstations in question, probably the easiest way, but I've never needed to do exactly that task.
The best way to learn is roll up your sleeves and dig in. One caveat I learned early on (I am a user like yourself)...is not to try and circumvent the Wizards in SBS. Use them whenever possible, they are your friend.
Tony
"...an eye for an eye leaves everybody blind" - M.L. King