May I throw my suggestion into the mix. A DVD called Full Busted by Marta Alto deals with the bust area as the title suggests. Marta was also instrumental in the book Fit for Real People, and if you can follow Marta's way to do the FBA you cannot go wrong. At the beginning of the DVD she takes you through the whole process very clearly, and of course you can stop and start the DVD as much as you want to, so by copying what she is doing may help you. In addition to the DVD and the book Marta tells you exactly what equipment you are going to need to be able to do all of this, and thus it is worth taking the trouble to look at this and compare to what you already have at home. i.e. a cardboard cutting out board that is already marked in inches, some Scotch Magic Tape but you need the 1/2" size, also you will need some Perfect Pattern Tissue by Palmer Pletsch and this is again marked up in squares, and you cut into strips different widths so that you have the correct amount to insert when doing the FBA. The first time I tried to do this I used stuff I already had, and made an almighty mess and what a waste of a pattern. I now have the correct items and having watched the DVD several times now I realise and understand just what is happening. Marta makes it look so easy, and it is just like having your own personal one to one tutor in the room with you. Marta is using real people to tissue fit and of course some of these people are lovely and slim whilst others are more generously endowed.
Once you have a garment that is fitting you correctly and is comfortable, then this is just the start for other garments, and of course you can then use designer features to make your own version just as nice as the pattern.
By the way I have mentioned the Fit for Real People by Pati Palmer and Marta Alto, this book has been around for a good few years now, and more recently they brought out an updated version and that title is Palmer Pletsch Complete Guide to Fitting. Both books are covering all sorts of fitting issues and again are using real people.
I personally find that the DVD Full Busted and either of these fitting books excellent and have helped me a lot in my own personal fitting issues.