is very annoying to do so, so i don't know how to build.

Also, blueprints are only visible when in one of the orthographic views (looking directly at the front/back, left/right side, or top/bottom). Turning the camera will make them disappear, but you can move the camera sideways and zoom in/out.

Open blueprints button, it will give you options to chose from (files). Go there and chose your blueprint.