Flows make much more sense when you're sat in the real aircraft, or failing that a cardboard bomber. Even with the master switch off, you can reach and touch the real switches and get a feel for where everything is - that's how it becomes a flow. I'd spend as much time as you can in the aircraft until you're comfortable.
And don't laugh, but I found some flows can be sung until they become second nature - the after start flow on my aircraft works well to the tune of The Itchy and Scratchy Show . . .