I don't think there's an easier guide than what's in the wiki. It's a little complicated, but just take it step by step. It's not as bad as it seems. I did it a few months ago. The process looked intimidating, but was surprisingly straightforward.

You shouldn't lose everything you have. It will clone your system exactly as it currently is. Your apps should still work, your files should still be there...

BUT any files that are located on the memory card you are cloning to will likely be lost. This is a result of the partitioning process. I found it easiest to copy everything on the card over to my computer, then copy it back when the process was completed.

Andy