Respectfully, it’s really not that hard, you just need to follow @arnb’s (very detailed) instructions, and you can ask follow up questions as needed.
The newest version of the smartapp is being discussed in this thread (as the title of this thread explicitly states, this version 1 is now deprecated):
If following these instructions is truly beyond your capabilities, then I don’t think that having someone else set it up for you will result in a satisfactory experience.
For one thing, you’d need to share your SmartThings login info so that they can login to both the mobile app and the IDE with a desktop web browser to install the code.
But then what? Do you reset your password so that they no longer have access to your ST account after this is setup? When the next version of the smartapp is released, will you update it on your own? Pay someone again to update it for you?
What about getting it all setup in the first place? Are you going to call or Skype with the person to check whether the various functions of the smartapp are working as intended (e.g. you open a door to check whether entry delay is working and report back to the other person if it’s not, then try again after they tweak something)?
A month from now, if you need to troubleshoot, is that included in your initial payment or will you need to work out another payment? What about if something stops working correctly again two months from now?
IMHO, if you are patient, follow directions, and ask questions in the thread dedicated to the most recent version of this smartapp, then you don’t need any computer skills beyond the ability to point and click a mouse.
If, on the other hand, there is some physical and/or sensory limitation that makes setting up and maintaining your ST system particularly difficult, then that’s somewhat of a unique situation and paying for assistance might be the only option. Just realize that if you pay someone just to install something, without accounting for ongoing maintenance, your experience may become dissatisfactory pretty quickly.