if you're looking at a workbench recipe, the bottom arrow buttons will lead you to more recipes of the workbench). If multiple pages are available, on the bottom there's buttons to go through pages of the crafting machine you're looking at (e.g. When looking at recipes, you might not always see what you want to at first glance.In addition, pressing U allows you to see all the recipes it is used in. Pressing R on an item will show you how it's made.Alternatively, there is a NEI addon called 'WAILA' which has the same core functionality, plus some extras. It is advised that you turn on the 'Highlight Tooltips' option in the 'World' category, as it will display the name of whatever block you are currently aiming at on screen. On the bottom left corner of your inventory, given that the overlay is enabled, there is a button for an options menu.The NEI overlay can be toggled by pressing 'O' while looking at your inventory.Here are a few tips that might make your life a whole lot easier:
Using NEI is crucial, and so is understanding how it works.
While there are plenty of mods that aid you in that regard, only Not Enough Items will show you all recipes, including ones that make use of modded machines. The Nuclear Tech Mod has many, many recipes, it's unlikely that any one person can memorize them all.