After you gain some experience you will find that you can judge the amount of glue that is required in a joint. This will lead to very little squeeze out and enough glue to do the job correctly. On my style and rail doors I have learned to use an acid brush to spread out the glue on the end grain of the rail. I know just how much to apply and never get any squeezout in the inside corner or coped corner. It just takes time and you need to pay attention to what you are doing and remember how you do it. After a while it will become 2nd nature to you.