Getting a garden design to follow?

Just curious about how to go about getting a garden plan from an expert to follow. Maybe a design with landscaping that's possible for the homeowners to do with a planting plan.
An established garden with a few issues namely paths are not very good (gravel on a slope that's basically going to flow down to the patio), gaps created by shrubs and trees that needed to be removed, etc.
I assume most garden or landscape designers will want to do the work too I order to make more out of the job. We won't have the money to do a proper job with an expert doing it all. However a possibility is a more basic option than the expert might do that at could manage in our first garden.
Any advice or suggestions? What to ask for / how to approach the expert about the job?
An established garden with a few issues namely paths are not very good (gravel on a slope that's basically going to flow down to the patio), gaps created by shrubs and trees that needed to be removed, etc.
I assume most garden or landscape designers will want to do the work too I order to make more out of the job. We won't have the money to do a proper job with an expert doing it all. However a possibility is a more basic option than the expert might do that at could manage in our first garden.
Any advice or suggestions? What to ask for / how to approach the expert about the job?
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Cambridgeshire/Norfolk border.
Also a designer who listens to any suggestions you may have and doesn't dismiss them out of hand, but tweaks them.
Garden centres local to us often have notice boards where garden service providers pin their business cards. And, though I have never seen this before, maybe you could pin your own request on the board asking for recommendations.