Critical will be a torque wrench for when your nipping stuff up, especially the sump plug and spark plugs. Be very careful with the sump plug and examine it when you take it out for any bits of thread as your screwing steel into alloy and most over tighten it and start to strip threads. Look for any sign of alloy thread on the plug and poke your finger in to feel for bits of swarf. Plugs pop out as they are never correctly tightened and as per the GTT article, strip the last 3-4 threads as they blow out. Same for the oilfilter housing, can be a tight *** to crack open and again, a lot are over tightened when reinstalled.
I have 3 torque wrenches, big medium and small (small is in inch/lbs), A good selection of torx bits as well as a decent socket set and a variety of long nosed pliers. If you looking at bushings, the appropriate tools and splitter's.
Also get the sliver bowls with magnets on the base to keep all the bolts and screws in one place and they are inexpensive. Also a decent rubber coated mallet for hitting things and even a bricklayers lump hammer can come in handy and a decent cheater bar.
Don't forget Modmini videos on YouTube, they are a must to watch several times to get the work order embedded in your mind before you start. I have been DIY cars and motorbikes for over 40 years and I still use them to give me a refresher regardless of the Bentley manual and Haynes manual I use.