I just finished making my first holster, actually my first time working with leather period.  The only experience I have had sewing was when I made a pillow in home-ec.  I couldn't find a holster out there that was like this, and the rest of the tuckable holsters were like $100 bucks... I have $14 in this one! 
I don't have the proper tools, I used a punch similar to an icepick w/ a screwdriver handle to punch the holes and regular sewing needles to stitch the sinew ( 
I broke like 8 needles). 
Guys let me know what you think, what I could have done better, etc.  I might have cut he holster a little low... exposing too much of the trigger guard.  It tests out to be extremely concealable with a tucked in shirt and very comfortable sitting and standing.  I used veg. tanned leather and am thinking of using shoe polish to finish/seal it.  Any reccomendations?