So many times I see excited new home owners attacking there newly purchased home with the purpose of recreating it. The excitement is later tempered with "OK now what do we do". If you approach an existing landscape with a professionals eye and a plan you may be much more selective in the demolition phase of re-landscaping a yard. Maybe some existing elements can remain and changed slightly, maybe some elements just need updating. Reaching out to a pro can really set you on a course of confidence and purpose when the sledge hammers, chainsaws and shovels come out.
Don't forget about grading and drainage, updating the irrigation system and renovating the tired existing soils.