It is pretty much guaranteed that voting on October 19 will be chaotic. There are ten questions that require separate ballots. Elections Alberta estimates that they will require 60,000 staff, a very tall order. It is more likely that the polls will be understaffed.
It is very important however that your vote get counted. Fortunately there are alternatives to voting on voting day, and it is recommended that we use them.
Mail-in ballots
Mail-in ballots are available from Elections Alberta. You have to apply to get one; instructions are here. You don't need to explain why, and in fact Elections Alberta encourages voters to use this method, so they have time to think about their vote. This is the best option, I think. You can apply right now, and ballots will begin to be sent out on September 1.
Advance voting
The other option is to vote at an advance voting location in your electoral division between October 13 and 17. As far as I can tell as of this writing those locations have not been published yet. Keep an eye on Elections Alberta if you want to go with this option. As soon as I find more information I will also post it here, so it's a good idea to subscribe!