Actually it should be pretty straight forward. Passenger side H-pipe to manifold may be a little tough to get to and will require an extension and possibly a swivel.
I stopped doing exhaust work because it sucks so bad. When my cars need exhaust work now I take them to the shop. I would guess it will be $85 for a muffler shop to install your midpipe, worth every penny IMHO.
It's a pain if you have to do the work while the car is on jack stands, but not too bad when you have a lift. Thank goodness I have two different military auto hobby shops I can utilize for this type of stuff. I can't imagine trying to install a cat-back or mid-pipe while laying on my back under the car.
I had to remove mine two weeks ago when installing subframe connectors. As I recall, you need a 15mm for all four exhaust flanges and 10mm for the hanger at the crossover. O2 sensors were 7/8in, I think. For the passenger side exhaust manifold flange, you WILL need at least a swivel, or most likely a u-joint. I would take that O2 sensor out first, too. Good luck.