Hi Vicky,
They are certainly knowledgeable and experienced but I would always keep in mind that nobody else can feel what you feel on a mattress so while “informed” guidance is always helpful you are the only one that can decide whether any particular mattress is the best choice for you.
Once the time comes to start your research into a new mattress then the mattress shopping tutorial here includes all the basic information, steps, and guidelines that can help you make the best possible choice … and perhaps even more importantly know how and why to avoid the worst ones.
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress that is the best “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for that are involved in each of them and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability, durability, and value.
Phoenix