SYY, you're right. This isn't for you. Stay away.
Ditched. Highly recommended! I joined as a DEC from B737 and had no problem at all. I can't emphasize this enough. The training you get at AAI is superb. They've been training B747 pilots for a long time and it's VERY clear they know exactly what they're doing and who they're looking for. The training materials you will receive at ground school are extraordinary. If you come from a Boeing, the transition is easy peazy. If you come from a narrow body airbus, it might be a bit of a stretch because you'll have to re-learn how to fly, but not impossible. A true airman will adapt. AAI know very well that previous wide body experience, though desireable, is absolutely NOT a prerequisite to fly a jumbo. It's an artificial hurdle that airline recruiters have traditionally put in your way as a means of making their lives easier by thinning the herd.