A3 8p newbie, fitting front fog lamps and other stuff!

[V1xhall]

Hi guys! Newbie here😳

I've just purchased a 2004 A3 8p 1.6 petrol and i have a few questions

1)was wondering how easy it is to fit front fog lights.  

2) i have some very worn knobs and switches. Where's the best place to get replacements and do the newer model parts fit?

3) best place to get good fitting mats and seat covers as these are pretty worn!

4) Any reasonable price upgrade/facelift/performance items i should look at?

TIA xx