There are a plethora of web development companies out there. I just performed a google search for "web design company" and it returned 1.5 billion results (that's not to say there are that many, but it's a good indicator when it's higher than "clothing company" or "law firm" or "fast food company"). So how do you get through the weeds to find the best one for you?
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It may be worth your time and investment into having your web developer take the time to install the same kind of tracking on your old website. This will not only allow you to get an understanding of what's working now, but also give you a baseline to compare your new website once it's live and running. You might find opportunities where your old website was finding success that your new one overlooked - it happens and that doesn't mean you or your developer failed - it's part of the ongoing process of improving and managing a new website.
In situations where you can’t find an included tutorial to meet your needs, you can often find instruction from a variety of web resources. Whether you prefer written instructions or want to see each step in a video, you can find free information online to help you move forward with your design. So, before you think completing part of the setup of the site is too difficult, hope into your favorite search engine and see what if the larger community doesn’t have an answer.