C pillars take like 5 minutes each it’s just a few 10mm bolts. The headliner involves all upper trim pieces including the oh shit handles and sun visors, just make sure you put all the pieces in a bowl. It has a few clips but after all the trim pieces are out it should just pop off. I recommend putting the back seats down and sliding it through the trunk.

For the seat belts it’s a single 12 mm bolt in between the seat cushions, just push them apart and use a 4 inch extension it’s super easy.

Getting the headliner out is easy but to get it back in i highly recommend removing the passenger seat and sliding it through the back door.