Quite different of what you will read in the most balletheel stories all over the internet I think balletheels dangerous for feet of the walkers of these. So people having pain after some steps on balletheels are eventually even better protected from harming their feet irreversibly with this shoe as they would not expose them to an excessive strain which our feet in all its structure and build is not meant for.
Having fantasies are legitime of course 
- kind of: you just have to walk balletheels very often and this will make you to a Balletheel specialist ( ) or being locked in balletheels by your Dom will make you a 24/7 balletheel wearer right away for ever and you would (be able to) always wear Balletheels for work, for other hobbies, for shopping etc.. Still, if having any ambitions in this direction one should stay realistic -to treat walking on balletheels as a kind of sport,- e. g. also mind the matter of fact that those who start walking balletheels TOO often, more likely run the danger of loosing the ability to walk ANY highheels all after a certain point.
In a certain way you have to decide either indulging your fetish or having a sportive attitude to it- so trying to be honest at this at least to oneself would for sure help,- respecively mixing these both things up is one of the most dangers in developping (long-term) balletheel walking abilities.
So in general it is that simple and easy as to see it as a sport – self evident things like warming up and down, not over-train, negative streching, developing general flexibility, and more important- strength of the feet, legs and your own body etc I actually do not even nead to mention, right? Consulting your med. orthopaedic specialist will be more reasonable as well as relying on as already mentioned more likely fantasy fed statements in internet.
So I cannot give you here more detailed general advice for balletheel walking training regarding the different aims and preconditions as well problems being very individual and issues mentioned above it either would be a book to write or short generalized statements which I think in this case quite ignorant and irresponsible. Also as I know the most just want to talk about balletheels resp. read what they want to read about walking or training them, either truth or not, – for this again there are plenty of sites in internet offering this – for me my time is too precious for that 
. If you are interested in Balletheels from the BDSM point of view, you might find here->(click) what you are searching for.
Private, personal consultation on walking balletheels as well as balletheel training with medical assistance is possible. You can use my webcam chat for that (an own webcam for a direct visual real-time control of what and how it is followed is necessary!) or contact me for an appointment for a balletheel lesson. I don´t offer any balletheel walking training via email due to lack of effectivity this way.