He, he jal, I enjoy your comparison to cook books and probably true to an extent. Most assembly manuals that come with Arf's now are quite good with the the products that come from Sig being among the best in the field. Years ago most plans that came with kits were just that 'plans' and you were expected to know what to do. I am talking about kits not ARF's, where you really built the airplane as opposed to an ARF where you just install the electronics and engine and possibly assemble the major components. Generally for both categories now though it is much better you will find subsequent projects much easier. There are even with ARf's hundreds of little details to attend to that no manual could cover and this is just another reason that an instructor or mentor is so very important.
Yes your servos will be fine. I was worried when you said two mounting screws that you were using micro servo that would have been inappropriate. There should be four grommits and four bushings for each screw. I have not been a Futaba user for years and it is possible that they use 'specticals' or they just pull apart. but the main issue is: No contact with the servo tray other than through the rubber.
Enjoy and forget the Butter, flour and milk and mix up a little part A, part B epoxy and get to flying.
John