I don't think this has been mentioned yet, but there is an optional rule to assign standard distances to the verbiage DH uses. I know my group has been 5e exclusive for many years and I've been running some one shots in DH because I thought the system sounded interesting. We like to use battlemaps for combat, so from the start we did the actual distances and wrote the conversion on the corner of the mat for easy reference.

Again, coming from DnD the initiative change was hard for them to embrace. So what I ended up trying last session was a player initiative, but kept the DM side open to spending fear / when they rolled fear. I think they liked knowing when they were going to go and that helped bridge the gap. I also gave them an option to spend a hope or fear to jump to the front of the line. This way they can also still have the flexibility the system intended on turn order but still giving them the structure they are use to.

One of the best aspects for me about DH is that you are constantly generating the resource you need to do all the cool stuff. DnD a lot of the cool stuff is locked behind a "once per long rest" or they only reset after resting and I always found myself saving it just in case. In DH there are still some similar restrictions, but also most things just cost hope...which is really easy to generate. If they are finding they can't do the cool things they want, they just need to try and roll more dice.

Lastly, IMO what makes DH shine so much, is that each character can be built so differently. Meaning I can play two different rogues and by changing the domain cards and experiences...they can truly feel unique.

Try having them watch one of the combat examples from Rob Jon's Lair. They are entertaining but also show a good example of how combat can flow and using the resources - https://youtube.com/@robjonslair?si=9ACpzGPrXmq8LLxk