I got my CRP a few years ago and there are only 7 appraisers in our state with the CRP designation. It's well worth it, but it's a very difficult exam. My relo business doubled once I was able to get my CRP symbol listed in the ERC directory.
I also have a background in real estate brokerage so I was familiar with a lot of that material, but the relo stuff from the 3rd party side of the deal was new to me.
It's self study and most corporate folks have in house training, so it's easy for them, and their employer usually pays all the costs. It's VERY difficult to do it all self study. I took a one day seminar presented by a local relo group and attended another tax seminar. The taxation part of the exam is very complex. My brother is a CPA and provided me with some better explanations of some of the more complex taxation issues. You basically end up memorizing the implications of various IRS rulings during the last 20 years.
I almost blew it in that I ordered my materials only a few months in advance of the test. I got somewhere near 2,000 pages of materials contained in various binders and books. The various books consist of ERC yearly research projects and are just filled with statistics. You get dozens of articles that are from Mobility Magazine and a few test questions generally come from each article. It would be impossible to memorize all that data, so the tough part is knowing how to distill it down to the major trends in the business. It takes hours and hours of reading and re-reading the charts and graphs so that you can identify the major relo trends.
As you well know, the materials cost a bundle as well as the test fee. I was really concerned after I ordered my materials too late because I really thought I wouldn't pass the test and would have lost a lot of money; especially after paying for the two courses I mentioned also.
If you are going for it. you need to order your materials right away. Good luck!