Take a look at my Albums below...
These do not cover complete 100% teardown, but it is enough to get you most of the way there, or enough to be able to figure the rest out.
If you have any questions, let me know.
If you have the old style top lever mechanism with the flat spring and cam/lever, a common issue there is the bolt retaining screw being stuck. I usually have to end up drilling out about 25% of the ones I have to take apart. Also, the small retaining screw in the water table which is for removing the unhooking slide pin can be pesky. They usually come out, but a small eye glass screw driver is needed.
Taking apart a Parker does not require any super specialized tools other than the proper run of the mill tools for gunsmithing. Just a proper sized pin for taking out the the hammers and springs.
http://www.parkerguns.org/forums/album.php?albumid=307
http://www.parkerguns.org/forums/album.php?albumid=366
http://www.parkerguns.org/forums/album.php?albumid=365