Plenty of YouTube clips for the 6 speed DSG in a hatchback Cupra, or other DSG variants.
None for the 7 speed DQ381 found in the ST, and it has a few quirks and differences around servicing, but still doable if you do your research.
You will probably need some special tools (pump and filler adapters) depending on what filling method you use.
I did my DQ381 7 speed a few months back.