I think it's important to know enough about the topic to be able to provide a comprehensive review. You don't need to hire a professional but you do need to do your own research. Read books, articles, magazines to help you better understand the topic. You don't have to be an expert but you need to be able to provide value to your audience.

You are better off providing comprehensive high-quality reviews of a few products than lots of poor quality reviews. Take your time with each product review to ensure that it is of a high standard.

You could create several pieces of content for the same product by talking about each of the different features separately. I would also re-purpose the content so in addition to providing a YT video, you can also create an Instagram post and a blog post. People like to consume content in different mediums so you need to cater to that.

I provide coaching for writers if you want to get feedback and advice about how to create content for a blog on this topic.