What an exciting proposal.... to replant, move, update, rejuvenate!!! When we moved into our 10 year old house, we watched, planned and waited. A hurricane came in and took out some of the plantings in the back yard, which was both good and bad news. With our budget in mind, we started work in the front yard. We removed the first group of plants. We improved the soil and enlarged the bed slightly. Then, we bought mostly 1 gallon size plants, along with a few larger ones. Some were a hit (spring blooms, plus the deer ate them), but some were a miss (conditions were not right for them). The next year, we removed the next group of plants and repeated the previous year of work. Then, we filled old bed areas with grass and planted a tree. Now, four years later, it all looks pretty good....but still not a "Yard of the Month". I want to add roses to brighten all the green, but as a retiree, they might be more work than I want.
So, if you have good bones to your garden, just move, remove, replant the smaller shrubs and annuals that will make a garden look fresh. Have fun!!! Try some new things!!! Or, if your budget is not a problem, hire a professional to make your vision a reality. Share photos with us too.