So the first book is a beginning programmers book? If so, that is awesome and I will purchase it right away. I don't know any programming.
Yep. Its the only beginner book big nerd ranch has and it starts from scratch. You start with C and how to set up Xcode, then you move to Objective-C and then Cocoa (which gives you buttons, text fields, etc). Its very well done.
Programming does get tough, there is no way around it. You will get stuck in places badly. If that happens (and it will) definitely visit the programming forums on here, post your code and what you don't understand about it and there are plenty of people here to help.
If you stick with it it will be quite rewarding.