It is very easy. Even if there are steps along the way that are confusing, there are plenty of resources to get the help you need. There are over 20 million blogs in existence, so it can’t be that difficult.
How much does it cost to blog?
There are many services that allow you to start a blog for free (see below). I suggest using one of the free services to get a basic feel for blogging and “get your feet wet.” Once you decide you want to stick with it and that you want to make money with your blog, I suggest moving up to a self-hosted blog (see below). Anyone who is really trying to make money with a blog will probably be more successful with a self-hosted blog. Getting a self-hosted blog may not be free, but still can be VERY inexpensive. You will need to pay for nothing more than a domain name ($10) and web-hosting (as cheap as a few bucks a month).