Don't try and make it yourself. Since you are inexperienced in decorative finishes and choose not to try the full texture route (Versiplast) and trowel on and work two layers of material, by all means go with the RL suede. It is not too bad if you apply it as they say. Be sure to watch their video at the RL site and be sure to test it out first before going to the clients' wall. Also expect to use more material then stated.
Post pictures when you are done, we'd like to see your work!