This is an important question. There are several things that you can do to prepare yourself to work in a high involvement organization.
First, you should learn what the company or organization does and prepare yourself in this area. The more you know, the more you will be able to start the job in a competent way. This is especially important if the culture is high pressure. You want to come into the company running, if possible. This will require research on your part.
Second, you should also talk to people who have worked in such an organization. These people will give you invaluable knowledge and advice. Ask them questions and ask them to give you the secrets of the trade. Wise people will learn from others who have gone before them.
Finally, try to gain some experience. Experience in golden. In fact, experience is so important that you may even want an internship, even if it does not pay. This experience will serve you well in the long run.