Just bought the racing beat springs along with new shocks and struts for my S3. How difficult is it to swap out everything? Or how much should I pay to have someone else do it?

 

Not difficult, but that depends on what tools you have.
For the fronts you'll need to compress the springs, and also spin the top nut without spinning the strut shaft.
The rears are a lot more basic.

Have you downloaded a service manual from foxed.ca ?

 

Did it make myself as a first time amateur using YouTube, manual and rented spring compressor. If you have an OReillys nearby, rental is free. Job is very manageable and you get the unmatched pleasure of driving something you built.

RADPotential has a good overview, but maybe over complicated as he is dealing with none OEM camber plates
Most useful tip is loosen the big nut at the top of the front struts, the one you access under the hood, before removing the strut.