I'm pretty sure,
If we're talking about a Taurus PT-111, the tricky part is getting the slide off the frame after flipping the latch and all.
It goes something like this (copy and pasted from another site):
Make sure gun is unloaded.
Check chamber again.
1) remove the magazine by pressing the magazine release button;
2) check that the chamber is empty;
3) pull the slide all the way back and lock it open with the slide lock / release lever;
4) rotate the takedown lever (located at the left side of the frame) clockwise until it stops;
5) carefully pull the take-down lever with its pin out of the frame
6) carefully release the slide stop lever, then push the slide all the way forward and out of the frame;
**This is harder than it looks, as I remember. I think it goes easier if you pull the trigger while you are pulling the slide off. If I remember correctly, it is a real PITA and I thought I was going to break something on the PT-111 I specifically took apart.**
7) remove the return spring by pushing its head slightly forward and then pulling it out carefully of the detent in the barrel;
8) lift up the barrel from the slide.
Reassemble in reverse order.
Good luck, and let me know if you still have problems. I will take apart my friend's tomrrow to review and see if I left out anything.