Although LR uses only a referenced file managements system, it offers the user the ability to use it's preset locations. If you are happy to just use LR to manage the images this will not be a problem, unless you want to have files stored on an external/additional drive, as you will have to tell LR which drive to use. This is not possible using iPhotos, as Apple basically wants total control over where you put things, so you have zero options. This is the cause of many of the complaints about the new import process. In an effort to make it "simple" they have removed choices, and also made it harder to confirm that you have made the correct, for you, selections. If you just want to use dummies mode, and let LR chose for you though all will be well.
Also the difficulty of LR is mainly with its abundant choices. For example I can quite quickly think of five or six different ways that you can end up with a JPEG file being exported from LR. Firstly there is the Export Dialogue, arrived at by hitting the export button in the Library module (there are multiple way of opening this dialogue too). This is often the usual way to export a JPEG or other file type. Then you can use the Print module, and you can use that to print to a JPEG file. Both the Web and Book modules will also get you JPEG files as part of their output, and I think you might also be able to get JPEG's from the Slideshow module. Finally it is also possible to set things up so that using Edit in gives an option that will allow you to render a JPEG and open it in an editing program. It is the same for many other functions, there are lots of different ways of ending up with the same results. The thing to realise is that you don't have to use them all. I have never used the book module, and only looked at the web and slideshow options in passing, but have never used them in anger so to speak.
As others have said though I think you would be much better off trying out Photoshop Elements. It has a similar organisational system, which can be integrated into LR at a later date if you decide to go that way. It also has a version of ACR the RAW processing engine, which has a simplified interface limiting access to some of the more advanced tools. It also includes most of the important to a photographer pixel editing tools from PS. It has some very good modes of operation that will either automate, or hold your hand as you work, although that can all be turned off and you just get on with it. It is a product that specifically aimed at the basic user who has very little understanding of how computers work.
Alan





