As everyone else said, yes you should plan on flying the published miss. But in reality you never fly all of it will unless your flying into an uncontrolled airport. If your flying into a major airport with a tower as soon as you tell the controller your making a missed approach or they direct you to make a missed approach, 90% of the time they will give you instructions, IE: fly heading ___ climb and maintain ____. Then contact departure ___.__. You will be driven around for another go. Now at uncontrolled fields the published miss is expected unless other instructions are given when you start the approach.