You must either use the services of an outfitter or be hosted by a hunter host. The hunter host must be a resident of Alberta. There are some limitations around who can be hosted and how many (i forget the details but the link already posted will provide the needed info).

There are also some nuances around applying for lotteries and how that is done with a hunter host. IMO, go with an outfitter. Will cost you more, but will remove a lot of the hassle, especially if you plan on going with any friends or family that are not residents of Alberta.

Good luck