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Help needed with planning native tree and shrub planting

I have a property in Swanson, that is mostly native bush with around 1/2 acre of grass and two houses (see photo attached). I need some help deciding on what tress and shrubs to remove from the grassed areas and what natives I should plant to blend in with the native bush well. The ideal person to help me would be: -Experienced in selection and planting of native trees and shrubs -Someone who has designed native garden layouts before -Able to draw up (or help me to draw) plans for planting of the property -Not too expensive as I am on a budget for the project. I only need help with the plans as I would like to buy the natives and do the planting myself.