Most of it is having the guts to experiment.
The best method I know is 'Don't take any sh@t from SWMBO'.
Get those puppies out into no-man's land. Away from side walls and rear wall. Move them back progressively until the bass becomes overpowering - then get them back out to where it was sweet.
No one talks about gear-positioning but if you want my hapeth, and after a few glasses of red, youre going to have it, don't put gear/chairs/ the mother-in-law in between the speakers.
No one talks about the listening chair. Get it out in the middle of the room and go back until you lose the 'room is a pair of headphones' effect. then go back forward. If that makes any sense.
I am not going to talk about room treatment because I would get shot down. But you really want it and it can be done for cheap, made to look good (practically invisible) and for a fraction of the cost of any component you can think of that you might be tempted to purchase to solve a problem with your hi fi which is, in fact, a problem with the room.