Hemant,
If you turn the wheels all the way one direction (left? I can't remember), it makes it easier to get the housing out AND you can pull it straight down without spilling anything. I don't lift the car when changing oil. However, I've gotten it out when the wheels were straight, from above, spilling oil everywhere! While you have it out, check and make sure the housing has a little rubber thing at the bottom (I'm not sure on this, Jim Villers claims it's supposed to be there, and I don't remember seeing it on mine - I'll check next time I change the oil). Also, make sure that you have only 1 gasket (I found 2 on mine).

Oil Pan: Theoretically I'm told it can't be done without pulling the engine. My mechanic did it but did a little frame work while doing it... Either Jim or Robby's had theirs off, so they may be able to tell you.

As for the filter. I believe that there is only the paper insert. Older style filters had a screen, but all of the replacements are paper with a screen on them.

__________________
Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)