At 7 weeks, most infants are still waking every 2 hours to eat, 24 hours a day, with the occasional 3-4 hour sleep stretch. Sleep scheduling isn't possible until at least 3-4 months of age. Babies aren't physiologically ready. When it is time to try, start making notes on when baby is sleeping, how long they sleep for and the method used to get them to sleep. You'll see a pattern there. You can then begin to adjust the patter in 10-15 minute increments, as needed.
I understand your frustration, as I'm a mom of 2 (5 1/2 yrs and 20 months) as well. As for down time... ask Dad to watch the kids for 30min-1 hour each day. It makes a world of difference. Alone time with Dad - sometimes you have to sneak it in. ;-) These things get better as the baby gets older. Mostly you learn to work with or around your kids schedules and you find the time.
To the mom who recommended "Baby Wise":
Babywise has been linked to the DEATHS of infants and toddlers. The feeding schedule has caused malnutrition, and death. The sleep schedule is inappropriate. The Ezzo's, who wrote the book are religious fanatics. They are NOT pediatricians, doctors of any kind, nor are they child psychologists or similar. They have zero qualifications to produce a book of this nature. This book has no basis in science.
As a Lamaze instructor, I council our parents to avoid this book, specifically.