First off, how old are you? If you are in your 20s-30s and in relatively good shape you aren’t going to have a problem at that altitude, just take it easy the first day and drink a lot of water. Keep in mind that when hiking at altitude up the side of a mountain it’s all about moving slow and steady, don’t make it a race and get yourself winded, you should be able to breathe and talk normally, if you can’t you are moving too fast.
If you aren’t in shape you are going to want to get there a couple days early, maybe just hang around town and do some walking the first day, the second day do a short and easy hike with little altitude gain, then just slowly ramp it up from there. Drink all the water you can, stay away from booze and soda, most people don’t actually get altitude sickness they just get severely dehydrated, the air is dry out here and it’s amazing how much water you can drink in a day.
The oxygen bottles are a waste of money, plus it’s just that much more weight to carry around.