How to make 2 clips have same volume? ...Speech leveler? ...Match clip volume?

I have audio clips with different volumes. I'd like to make them the same. Wow, has this been hard! 

Well, it seems doable using the Speech Leveler effect. However, when I use that I find that I get such loud breaths in the result that Noise Reduction can't remove them without excessive distortion. Any hope?

I also see that I can pull up the yellow volume line of a clip to change its volume. That seems like a crude, awkward method. But it doesn't seem to add distortion. 

In the pursuit of equal volume I've tried to learn how to determine what is the numerical volume level or average of a clip. I've used the Amplitude Statistics button to take readings of clips. I can get an Average RMS value by doing that. It seems like these numbers vary quite a bit each time I re-scan a clip or audio selection! And that number doesn't seem to be very useful for helping me make 2 clips with different volumes have the same volume. 

Anyone have a link to wonderfully helpful info about how to handle this? ...Yes, I'm new to using Audition. I'm trying to record my own audiobook. I used several different mic's, sigh. Now I'm trying to make everything sound the same, or close enough. I think it's mostly quite spot on. I just have a few places where the volume differences are noticeable. Maybe I should just manually screw around with them. I'd rather learn to understand a bit more about how to do it right. Sort of. Really, I just need a workable result. Thanks!

PS: I might have answered my own question! I was trying to use Match Clip Loudness from the pull-down in the Clip section of the top menu bar. But I see there is a Match Volume in the Effects section. ...And I also know there's a Match Loudness *panel* in the workspace. I found a YouTube video explaining it and I finally got a result that SEEMS like it might be working pretty well! Here's the video, in case someone else is struggling: https://www.youtube.com/watch?v=_bSf1Wr2nEg. Further info and tips are still appreciated! (By contrast, I had no luck with my first attempt and following the info at this link: https://www.youtube.com/watch?v=_bSf1Wr2nEg.)