The internal hammer at the back of the slide is pushed in and the slide pulls upward. There is actually a tool for this but you can use anything that fits, push in the hammer until it clears the retention bar at the hammers center then lift the slide. Be careful the springs are under pressure and will shoot out. There are two springs one at the front for the slide and one at the back for the hammer/firing pin.
As far as taking it apart, it depends on the model. Check your user manual. If you don't have one, call the manufacturer.
20-60 USD or so
250
Impossible to answer without more information.
The value of a Titan handgun 32 cal is $159.99.
Made in Germany or Italy
No published history.
10-100 usd
22 cal. dillenger worth
You need a gunsmith
45
25-50 USD or so