I am very used to bottoming out and I'd like to buy some super mushy o rings that are 1.5-1.9mm after hearing that bottoming out on cherry mx reds too hard can cause strain. I've also read that taking the keys out will void the warranty and it's very difficult to install the O rings onto the space bar and other large keys without damaging the keyboard. It could be perfectly simple and easy I just don't know. Which ones should I use, or should use o rings at all? Some advice one the installation would be helpful too 
What? I hate you now that I've read your paragraph...

It is a straight forward process. all very simple. If you're Under 14yrs of age... You might have trouble...
the rings go on the "stem" of the keycap.. not inside the switch.
Thick Orings are great, I recommend SOFT + Thick. You can make your own "ghetto rings" from old rubber dome keyboards. there's a thread on that @ geekhack.. use search...
The ones they normally sell, are 40a, which is STILL very hard, they're as hard as pencil erasers, which is pretty hard....
You other choice, is using Silicone dental bands... they're tiny rubber bands people use for "braces" on their teeth.. but they will fit Cherry mx switches perfectly. And they are extremely cheap on EBAY....
I also DO NOT recommend those "soft landing pads" because they might travel up and down against the shaft of the stem causing friction, or tearing it into the switch housing itself...