Hi
I took my oil pan off for a oil and filter change and it practically fell off once the oil hose and 14 screws were off, on my pan at the front and back there is a couple of "lips" protrusions maybe you could prise the pan off with adriver against the lip of the pan and against the exhaust at the back and against the oil hose union at the front but go gently, or you could you could wait for a reply from one of the seasoned pro,s to give you advice.
Gary