There is no "easy" method.
You have to assess what are the critical characteristics of the products after the processes and ascertain if you can determine by examination if such characteristics are achieved or not, without a destructive test.
If you can't, very likely, you have to control process parameters which have demonstrated (by validation, including destructive testing) that results in conforming product.
One must have a good understanding of the product, application, context, materials and production processes to determine if the process needs validation or not.