Im horrible at DIY too, but i take it as cooking, anyone can cook, but there is a reason why there are whole careers dedicated to cooking, something i cook even if the same recipe will be crap compared to what a chef can make, because the chef wil probably grow its own tomatoes, he will know the exact ammount of salt to add and when, maybe even add a little sugar in the mix even if its not in the recipe because it balances something, and a lot of other small details that go a very long way, and as far as i know no vendor will reveal their processes.