I imagine that the murder, for some, is the easy part. It's the aftermath that is the hard part.
Barry should have stuck to the K.I.S.S. method. He did a great job with hiding Suzanne's body. I think the the place was picked far in advance.
It's the complicated staging/cleanup/alibi that is going to seal his fate. I really think that he planned to use firefighter training as his alibi until the class was canceled due to Covid. Then, he had to scramble for a second alibi, which really didn't work for him.
I really don't understand the scattered dumping at all of the places in Broomfield. What was up with that? And, all of the changing of his clothes. No, that's not suspicious...I think that, in his effort to be efficient, he wasn't effective at all.
Of course, only time will tell.
JMO.