This is doable job.
I replaced radiator and aircon condenser in front of radiator without significant mechanical experience.
Two more things from me:
1. Be careful with two aluminium pipes at the bottom of aircon condenser. They are aluminium and very easy to damage. If you bend them they'll probably develop a leak and pipework to condenser will need to be replaced. Because the junction between pipework and aircon condenser will be diffusion/rust "welded" you will probably need to replace aircon condenser. So be careful.
2. After you swapped radiator you will be installing temperature sensor to your new radiator. There is an o-ring for that sensor and I'll advise to change it. There are two other o-rings where gearbox cooling pipes connect with radiator. Renew those as well. When you connect two main coolant hoses to your new radiator it they may still leak, so I'd suggest to use a bit of Hylomar BLUE universal gasket and jointing compound on the nozzle that goes into the hose. Make sure you use "blue" variety of the product since it is non-permanent.
http://www.ebay.co.uk/itm/221156317650
https://www.youtube.com/watch?v=yXiVZIBoHL0
Use only genuine Audi radiator.