There's no crash course for being a high class provider. Being a high class person and provider are the same thing. If you don't have the means to live a lavish life, or do things that require an above average financial situation, then don't fake it. Just find that balance between the value you have for yourself, and the amount you can charge in order to make ends meet where the phone won't stop ringing.
Being high class is a state of mind. I don't know how your got your start, or why you decided to become a companion. But there are companions of all types advertising on the internet. Being that you are married, I would think that you two would put a great deal amount of thought into the way you would work as a companion. Deciding to start with half hour sessions says a lot. I'm not judging you, but I'm just saying. It says a lot about your business sense, needs, and attitude.
Balance is key. Live your life. You should not be focused on 'becoming' an HDH. HDH's are HDH's because they can be. They are so many things, and just looking the part is only the beginning. If you can't afford to wait on clients at HDH rates, don't attempt it just for the hell of it. There is no shame in working the way you HAVE TO in order for you to make it.
One day, you and your husband will have everything you need in order to meet your goals. Your wardrobe will be the envy of all women. You will have been so many places, and done so many things, and accomplished so much. There will be nothing to do but celebrate, vacate, and appreciate. At that point, you will be a HDH, and you can charge whatever you want.
Just something to think about. All the best to you and yours!