A pump jack with jack stands, or better yet a Quickjack
Metric socket set
Metric wrenches, preferably rachet type
Metric spline socket set
Hex head socket set
Torx bit socket set
Vice grip set (useful to remove nuts and bolts, especially if stripped)
Breaker bar + 4' steel pipe (place pipe over breaker bar to add leverage to help loosen stuck bolts)
Electric driver with metric sockets (saves a lot of wrenching time)
4-1/2" electric grinder with cutting wheels (sometimes comes in handy to cut bolts, exhaust, etc.)
Good tool vendors - Harbor Freight (inexpensive), Northern Tool (a little bit better quality), and NAPA Auto Parts (professional quality). Other places to look for specialized euro tools is ECS Tuning who sells Schwaben brand. I am also seeing decent tools sold on Amazon, Home Depot and Lowes.