Off memory the heat shielding in the engine bay has 10mm bolts, get some ratchet spanners or you will be there your entire life trying to get them off. Also track down the weather shield removal to make your life even easier (actually start with that step, will make everything else a billion times easier, then its just remove top mount, remove heat shielding, like 10 bolts holding the DP together and onto turbo / exhaust, and job done, see, easy
).
Will also need a proper o2 sensor socket to get the wideband off (and remember be careful so you don't damage it, sh!t aint cheap).