"If you are mechanically inclined, the hardest thing will be getting the car up in the air high enough. I have a lift in my garage so to me it's not a problem. The largest maintenance item will be the cam tensioner pads. Read up on that. It's tedious but not that hard. Plus, you can do the water pump and belts at the same time. The timing belt should be replaced every three years by 1992-1995 standards, but the belt materials have improved over the years with many other manufactures now saying 5-7 years between changes. Read up and make an educated choice. If it's a Tiptronic, be aware the rubber coupler on the flywheel will eventually need to be replaced. I've replaced them in my 2 968's and the cost has skyrocketed to around $2000 per part. If it's a 6 speed, you will eventually need to replace the dual mass flywheel and clutch setup. Both are about the same in parts.
Aside from that, it's a fairly easy car to work on once you get past separating the BS from the facts in your learning curve."
It's very difficult to find the correct pressure plate for a 968 when you need to replace it. As for the dual mass flywheel, I think a single mass flywheel is acceptable and, while not "stock", is definitely more affordable.
Again, regular maintenance is doable by us amateurs, but finding parts is what I find to be the challenge.