2008 Yaris exhaust replacement question

[2bz]

The pipe back from the resonator on my kid's '08 Yaris is rotted out. It's the OEM welded type and we've already replaced the rear muffler and pipe section. So, I decided to bite the bullet and buy a manifold back replacement (Cats, resonator, both O2 sensors, etc.). My concern is the amount of space available to get to the manifold flange bolts and the upstream 02 sensor. No lift or air tools available. Any tips for getting the front of the exhaust system free? Thanks.