This is what it really comes down to. Getting comfortable skiing in the backcountry, and getting the certs and experience. You have a certain amount of recorded days and nights spent in the backcountry before you can even be considered for the ACMG preguide training.
Now on the topic of ACMG vs CSGA, there is talk of Helicat Canada getting involved in CSGA to try and make the standards similar to ACMG, thinking along the lines of CSGA 1= pre guide training, CSGA 2 = ACMG assistant guide and CSGA = full on ACMG guide.
Although this is all speculation from people that I know who work in the guiding industry. I myself have researched this and I am still on the fence for which type of guiding I want to get into, as I have made acquaintances that are both CSGA and ACMG and both have their own strong points. I've done a fair bit of research on both sides, so if you have any questions feel free to pm me.