did you pull the mani/turbo assembly off of the car or are you doing this with everything attached to the block. If the latter, you may want to pull the whole thing off. It makes like easier.
Second off, lock tabs are evil. Search for my post on that if you care to see my true feelings

Screwdriver and hammer are how I bend mine out of the way, and when you go to reinstall, either don't put antiseize on the nuts, or use locktite. But if you decide to reuse the locktabs (which I do recommend. they're nice insurance from having to pull that crap out of the car again to replace a blown gasket), take a wrench (14mm works best if i remember correctly since the nuts are 13mm) and use a hammer to reshape the tabs to the shape of the nuts. Then take a punch and use it to tap a dimple into the tab and nut, that should prevent it from ever wanting to let that nut vibrate out.