I know has been covered before, but targeted help would be appreciated.

 

my fabia has never had the leaking door seals fixed. I followed a guide last year to try and fix them, and it didn't work. 

 

Now I've either got the choice to try and do it again myself, or see if the local skoda garage can fix it. 

 

If if I do It myself, what exactly am I going to need?

Place to look-

https://www.briskoda.net/forums/topic/213819-the-extremely-useful-fabia-1-topic/