Unlock room after accessing other rooms- Need help setting up

Hello, I recently posted this question and someone was very helpful in getting back to me with an answer. I an unfortunately a very new beginner to UE4 and had difficulty applying his answer to the program, would someone be able to set up a blueprint that fixes the problem for me and screenshot it so I know I am on the right track?

Original question: I am trying to create an area that is locked until you have access different areas of the map. I have 3 rooms and I want the 3rd room to become accessible only after having visited to the 2 other rooms. I would like the wall blocking the 3d room to also be destroyed with a destructible mesh when it access. Thank you for your help!

Answer from Narghile:
Hi Mate
Quite ease, put 2 trigger boxes on the entrances, make 2 Bools, room 1 triggers first bool and room 2 does other.

Run a check on begin overlap, check if both bools are yes, when yes, destroy wall.

What i would do with wall, make one a SM and another a DM.

When you are ready to go, destroy the SM, replace with DM, add damage to DM.

Done

Narg

Thanks for the help guys!