Typically, yes. Most systems are made to be user-friendly and very easy to install. Solar panels are known to be the easiest to install, assuming you have already considered where you will place them and how the sun hits your house. However, if the unit is not installed by a professional it may affect the warranty. So it is better to check your warranty limitations first.
Another reason that you may want to leave it to the professionals is the ease of mind of knowing that the machine will be running at its highest efficiency and that it will be safe. There are very strict guidelines to follow and knowing that you and your children will be safe around the machine is priceless.