Disassemble Ithaca featherlite shotgun?
If you are talking about complete disassembly you should probably buy yourself a copy of "The Gun Digest Book Firearm Assembly Part 5: Shotguns" by DBI Books, inc.
If all you want to do is remove the barrel then after activating the safety turn the magazine end cap clockwise until it stops then turn the barrel 90 degrees clockwise and remove. You can certainly continue disassembly if you want to try as this is not a complacated shotgun. The description to do so though is quite lengthy.
I am assuming you are taking abouit either a Model #37 or a M#87
What is a Ithaca model 37 featherlite 12 gauge pump bought in 1937 worth engraved with pheasants and pointer 95-98 condition?
Most all the Ithaca Pump model 37 were Engraved with 3 ducks and on the other side Pointer Flushing out 2 pheasants. It a common engraving we all see on Ithaca but you have an 1937 model like I do ,I have one as well with a serial number 2493, believe me they are worth keeping because that was the 1st year Ithaca made the Model 37 they only produced 3,500 shotgun in 1937