All three my kids are GF babies. I struggled with breastfeeding ( had to switch to FF eventually but this was nothing to do with GF) - but still found working towards the routines very helpful.
All 3 were sleeping 10:30pm-7 by 6months. I have many friends for whom bf & GF worked well too.
(as an aside the difference ff made to me was mainly to relieve my own mental and physical agony!! otherwise my comparative experience was the same. When I was bf, I expressed and my husband therefore sometimes could do feeds.)
The routines are basically a structure you're aiming for, not a straitjacket which determines your every basic thought as has often been suggested.
Even with my three I worked differently within the routines, sometimes because of our circumstances (school runs etc) ; sometimes because of the baby's specific needs/temperament (dd1 eczema, struggled to bf; dd2 brilliant sleeper almost immediately; dd3 slllloooowww feeder + 2 older sibs).
Another important thing to remember is that it takes time to settle into something - so if naptime (for example) doesn't work on one or two or even three days, keep persevering.
Last thing: if you're happy that what you're doing works for you and your baby & family it helps alot to stick things out when they get tough (as they will; such is parenting).