Ok, as a "newbie" myself, reading through your questions, I kept coming back to one question myself. Why wouldn't you want to climb with a guide? The things you learn are invaluable. They are lessons that can save your life. My daughter and I just decided to start climbing last year. Here's what we did and how we learned what to buy and what to take with us. We live in the flat lands of Ohio and didn't know anything about climbing. We decided to take on a mountain a little bit smaller then Rainier first, and one that has an easier climb. We chose Mt. Adams. We went with the mentality that it was our recon mission...one in which the summit wasn't important, learning our skills was. We hired a guide for the two of us, instead of going with a bigger group. We wanted to be able to ask as many questions as we had. We spent two days on Adams (no, we didn't summit). He answered a million questions on gear, food, altitude, etc. He took us out on a glacier and taught us various things on how to use our gear, self arrest, etc. We learned what kind of a tent we would prefer, what foods tasted good up high, things that made our packs too heavy, and things we wish we would have brought. We also learned what we had done wrong in our physical training at the gym and what we needed to work on more. We now know what to expect this year. We wouldn't have learned these things without the guide. We also read book after book. I think we own every book on mountaineering that amazon stocks! Knowledge is power. Read anything and everything you can get your hands on. After Adams, we went up and spent a few days on Rainier, going up to Muir and hiking around by panarama point. We had beautiful weather and loved every minute on Rainier. Our goal, like yours, is to summit Rainier. We are now training for that. Ok, to make a long story not much longer, remember that you can get a lot of your questions answered on line. Google is a wonderful source for altitude sickness. The various mountain guide services have required gear lists. We researched and bought the majority of our stuff online. We signed up with the various climbing stores emailings and have gotten some great coupons. I don't think we've paid retail for anything. If you'd like more info on the places we buy our stuff, get in touch with me. Again, consider a guide and good luck!