Name the actual problem.
“The room is wrong” is a feeling, not yet a brief. Is the light too cold? Is the storage awkward? Is the finish fighting the wood? Give the problem a name before giving it a budget.
Keep something.
Decide what is already doing its job. A project brief with nothing in the “keep” column is worth another look, especially in an old house. Sometimes the best purchase is the one you discover you do not need.
Separate the wish from the unknown.
You can know the result you want without knowing the method. Write both down. The unknowns are questions to investigate, not gaps to fill with the first convincing answer.
Then make the list.
Measurements, compatibility, samples, appropriate professional input, and the whole cost come before a final order. Buy for the decision you have made, not the one you hope the purchase will make for you.
The learning stays in the story. So does the useful part.
Make your own project brief