Measuring Angled Kitchen Countertop

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Hello to all reno professionals!

I am currently renovating my live in house hack. The cabinets have been bought and I will be installing them. The kitchen countertops however, I am unsure what is the best action to take? The walls are angled and I am not sure how to accurately measure the angle to cut the countertop? Is there a tool or technique anyone knows of? I am planning on laminate countertops but I have not seen any videos or articles explaining the best way to do this? I feel that this may be way over my head and its best to get these fitted and installed by a contractor? I know Ikea has budget friendly laminate countertops and they have installation service. Although I am keen on learning everything reno from first hand experience, is this something I may be able to figure out myself?

Thanks!