2000 Dodge Dakota oil pressure drop to 0 problem - Oil pan

I've found that the probable cause is a clogged filter screen inside the pan, however there is a steel bar blocking access to two of the bolts I need to remove to pull the pan out. I can't remove the bar, I've tried muscle and air pressure wrenches and the thing ain't coming off. So I gather I need to pull the engine to get at it. I've never pulled an engine so I need a guide on how to do that, or if I'm wrong (hope I am) then how can I get at those bolts. Bolts are on the rear driver corner.
[img:1444b3e277]http://www.2carpros.com/forum/automotive_pictures/327759_bolts_1.jpg[/img:1444b3e277][img:1444b3e277]http://www.2carpros.com/forum/automotive_pictures/327759_bolts2_1.jpg[/img:1444b3e277]