The pro's and cons of hiring a professional vs. doing it yourself
There are a number of pros and cons to paying for a professional installation vs. doing it yourself. The first thing we always think of is price, but it's important to weigh all of the advantages and disadvantages before making a decision.
Unless you've done a similar project in the past, a professional will always win in this category. One major thing to consider is all of the codes, permits, and inspections that are required for this kind of project. (Make sure to contact your local gas provider for more information on this if you decide to DIY it.)
Professionals will be able to tell you about other jobs they've done, similar to yours, which could help you save time and money by getting it done right the first time.
There are no guarantees for a DIY job so it's important to realize that you will be taking on all the responsibility for any future issues resulting from an improper installation. So you may save money on the front end by installing it yourself, but then have to hire someone to fix it later and potentially spend more than the original cost of hiring a professional to install it would have been, not to mention the headache of dealing with these issues.
Also consider how your finished product will look compared to a professional's work. If you're not a perfectionist, this might not be of huge importance to you, but you want to be able to enjoy your new fireplace and love how it looks in your home.
Without the previous experience professionals have, a DIY installation is bound to take more time than you originally planned. Even if you save money by doing it yourself, you'll be paying more in time than you would otherwise. If the scope of your project is small and feels more manageable, this might be an even tradeoff for you - Just ask yourself, how much is your time worth to you?