Sounds like you are doing your research. Having grown up in the mountains of Colorado, I can say that you need to be prepared. Depending on the season, you can expect cold weather in October and snow in November.
I would recommend that you buy the best gear that you can afford. Your tent is one of the most critical pieces of equipment. I always used a good 4 season tent ( the lighter the better). If you get caught in snow or rain, it will pay for itself..
Water is a key factor also.... I pack a small water filter ( I use a SweetWater Filter) so I do not have to pack large quantities of water & topo of the area so I know where the water is.
Start now and get in shape. The altitude has ruined many a hunt. The better shape you are in, the easier it is to get up the mountains.... Good Luck! Enjoy!