Actually you only need to pull the slide back about 1/2 an inch. They also make a dry fire kit for them so you don't have to pull the slide at all, but I don't know how much it is. Many Glock store sites have them.Just from dry firing I can already see that it's quite a bit different than a 1911 but I'll give myself a few hundred (more or less) rounds to get used to the G17 trigger and if I can't or determine that the strain isn't worth the gain I'll put it up for sale at a decent price.
I'm not a defeatist and I do want to master the Glock striker fired trigger and possibly down the road even start competing in GSSF matches in the Super Senior division but life's too short (especially when you're already 70) and if it doesn't eventually click in my head so be it.
Unless there's a trick to dry fire practice with the Glock getting the trigger to reset without ordering the dry fire trigger kit from the Glock Store for over $200.00 it's sort of a pain in the butt and gets old pretty quick......fire pull the slide back, fire pull the slide back.
https://www.glockstore.com/Reset-Trigger-Kit-for-Glock?quantity=1&custcol19=120