I read the books too and they made me feel crazy b/c my kids weren't doing what it said they should be doing....so I stopped reading the books!
each of my boys has been different by far, but it was an average of about 6-9 months before they were napping and sleeping regularly at night. At 6-9 months they were napping around 9-10 AM, 1-3 PM, and a quick catnap around 4:30 or 5 PM. Then bedtime was around 7:30 or 8, and they were sleeping 10-12 hrs. (but for a couple of them, the naps were short, catnaps, or nonexistant for a LONG time!)
I never found anything that helped them nap longer at a young age, but as they grew we tweaked a few things around the house that has helped them become great sleepers (air purifiers for white noise, room darkening shades, bedtime routines, nap schedule, etc) at ages 4, 3, and 1.
Hang in there Mama!