When you have a plan that needs to change, go ahead and change it. A rule you should have for plans is to stick with them even if it is an edited plan.
You have to adhere to what you have. If you change, in accordance to something that you see works better, and then edit the plan, make it public and try again. Any plan is not set in concrete. It is there for you to edit and change.
Think of it as a template. Plans are a guideline. The result will thank you for it if there is some deviation to get to the result.