There are two kinds of people: those that like to do everything themselves and those that don't. The former group is probably going to end up saving money and they're going to learn more about the finer points of home renovation. The latter just want to have a nice home. They don't care too much how it's done and they may not even care about the price, they just care about the results. If you're the kind of person that likes to get their hands dirty, you have to realize that there are some things that you can do and some thing that you really should leave to skilled and experienced professionals.
Most of the things you can do yourself tend to be somewhat minor improvements, but they can nevertheless have a major impact on the look and feel of your home. One of the best ways to see what you can do yourself is to stroll up and down the isles of your local home improvement store and see what catches your eye. These stores cater to the do-it-yourself crowd and are staffed with employees that can offer their expert advice when asked. It's true that these stores also sell their services too, but by and large they cater mostly to people that are looking for materials so they can do the job themselves. Almost anything is fair game at these kinds of stores. If you're new to home renovation you'll probably want to start with something easy before progressing to a difficult project. Consult the staff there to figure out where you can start. You might also want to get a book to help guide you through the steps. Also don't forget that the internet is a great resource for such projects.
Then there are other home renovation jobs that will be very hard for the weekend warriors. It may even be next to impossible to complete for them. It's not because they can't do it. It's because those kind of jobs either require a team of professionals or require a lot of skill and precision work. Expensive materials could be involved as well. An example of such a job would be a replacing an air conditioning unit. Such a unit is heavy and expensive, and so installing it yourself could prove to be difficult and multifaceted. Some amount of improvisation may also be required to accommodate the unit in your home. It would probably be best to let a professional install it for you. Another example would be installing new windows in your home. Modern windows can be a lot more expensive than you might think, but they can offer many advantages over previous generation of windows. Actually, they often work in conjunction with air conditioning systems because they provide better insulation. They can help keep your home cooler when it's hot and warmer when it's cold. Eventually all homes will have advanced windows, but in the meantime it's only for people that bother to initiate the upgrade. You probably cannot perform window replacement yourself, but there are many professional companies out there that consistently produce quality results.