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The most important part for you is focus. Just sit down, close your eyes and focus on your goal and visualize it.
Traditional breathing techniques are more for other uses of meditation like astral travel or other things, but you dont want to calm down, you dont need to get into that deeply meditative state, you only want to get motivated.
So just visualize your goal and specifically you feeling you get in that moment when you've achieved it !
If you close your eyes now and imagine a house, then you can do it instantly, so that's really all you need to do without paying attention to breathing or rules much.

Many thanks you are a great help. I will try it out.