I have zero luck with a disposable razor, always cut myself and leave half the stubble behind. With my straight razor, nothing gets left behind and I never cut myself either but shaving with a straight razor does rake practice.We have a strop here also, but Kenneth when he has time to do it up properly also always shaves with a straight razor otherwise if in a hurry he uses just the cheapest disposable he can find. He grew up watching his Granddad do it that way and just found the whole procedure with the mug, brush, and lathering up interesting and fascinating.
I've heard practicing on a balloon (inflated) works for a novice but I never did that. Just 'roughed it' until I learned. One thing about a straight razor is, you can feel each beard hair as it gets sliced off.
Being part Indian, I don't have to shave but once a week and '5 o'clock shadow' takes about 2 weeks to appear.