Yes. Be sure to shut off the electricity at the breaker before starting. Also, check your local building and electrical codes to make sure you comply with them.
The answer is yes, you can, if you do the proper research first.and have the tool's to do the job. According to the style and build you may need to know basic electrical skills such as ground wire and leed wire.Should be easy to do with a search on how to DIY.
In theory you can install this yourself with the right tools and knowledge. The problem is that this can be a tricky instalation, and if you don't do it right you could be spending way more heating water that's unused.
yes, there are do it yourself kits that are sold at the local home improvement store. Be sure when you purchase to take all the pool information with you.