With shared hosting, you’re sharing a server and that server’s resources with a bunch of other websites. With a VPS, you’re still sharing some resources because that’s determined by the hardware, but the software itself is set up in such a way that one machine acts like multiple different servers, providing a different virtual server for every user.
A good comparison of using a virtual private server is the process of owning a condo. You share the property with a few others but have ownership of your own space. Medium sized or growing companies who desire a bandwidth upgrade are perfect VPS users. For a moderate cost increase, they have a more customizable, reliable and secure system than they would have with shared hosting.
It's rare to find a web hosting provider that offers free trial periods, but luckily, money back guarantees are common. Typically, web hosts will allow you to sign up and purchase a plan, and if you find that what you bought isn't the right option for you, you can take advantage of the money back guarantee to receive a full refund of the fees you paid.
Moving to another website consists of transferring the website’s files and databases, configuring your site with the new host, and directing your domain’s DNS to the new host. Once you pick a new site host, they can usually help you out with this process. The cost will depend on the host you’re switching to, but it will probably be anywhere from $150-$400.