Depends on what kinda person you are. If you are a nit-picker who will notice and hate every single little ‘flaw’, then no. Go hire someone else to do it and then bag on them.
If you are someone who is flexable, likes plants, and isnt affraid to get alittle dirty, then go for it. You will take far more satifiaction from ‘your’ yard, even if it has a wart or two, then from something you paid other people to do. I have helped my dad re-do his yard, ~1.2acres, 3 times in my life. It isnt hard, it just takes a while.
First off, find a gardening club. Tour their yards, see what they did. Find what you like and what you dont. I once saw a $20’000 cactus tree, these things can be expensive. Dont just go to Home depot and buy. (Plus these guys are plant junkies. Get to know them and they will do your yard for free, plus give you some pups of species you wont be able to find anywhere. You just gotta be apart of the group first.)
Second, go get some good books. Read. I had no idea how beautiful some cacti/aloes can be. Just Awsome plants.