15-75 dollars
a semi automatic 25 caliber pistol.
Best left to a gunsmith
Ask a gunsmith for help
Best to let a gunsmith show you how.
50-150 or so
take it to a gunsmith to insure disassembly is done right.
If you don't have an owner's manual, find a gunsmith and ask for help
Try e-gunparts.com
The pistol is cheaply made, you proably don't want to go any further than field stripping. Here's how to strip it: Remove the clip and make sure the gun IS NOT LOADED. Double check that the gun is not loaded. Triple check that there is not a bullet in the chamber. Push in the button under the slide towards the rear of the gun, on the side that says "Sterling Arms". The keeper kill pop out of the back of the gun. Lift the back of the slide up, then back and off the frame.
About $100-$125
Go to this site and click on Colt .25 hammerless. It will bring up the instuctions http://stevespages.com/page7b.htm