Sure,

Firstly, you don't have to be an expert, unless you are marketing yourself as one. You can just be a user, and provide an honest users review, which is totally fine. However, there is nothing stopping you from watching youtube videos from other reviewers, reading some blogs on the product and preparing a little script of notes and points that you would want to mention. There are a couple of big names out there for reviewing certain tech products - so if people want that kind of full on professional response that's who they are going to go to. So i would not focus on reviewing much of what they are reviewing from a technical perspective. If you are going technical you really need to know your stuff - because tech heads will eat you up (if its tech) - i would suggest making the videos from a user experience angle. Embed the videos on your webpage, and use the SEO and web traffic to push views to your video and build some authority on your channel. Over time it will grow so just keep it authentic.