It's hard, but it's doable. Once you find your routine, it gets a lot easier.
One word of advice - take an hour to yourself every night, if possible. If you have a spouse, let him/her watch the kids. If not, pop in a video and leave your door open. Bubble baths with my favorite magazine got me through many a bad day. Reading a book on a bed did as well. Pretty much anything that let me feel like an adult while shutting out kid complaints, even for a little while. Homeschool parents call it "making sure you take time for yourself" - without that, you can overwhelm fast.
Okay, and a 2nd word of advice - don't stick to a school schedule of 6 hours of learning. One, you don't need it...and two, you'll burn out. Get 1-3 hours of focused learning in, depending on your child's age level, and then let them self-direct for 1-3 hours later (legos, audiobooks or regular books, nature walks, arts and crafts, learning videos, etc). The longer hours should be HS-level...none of mine under high school have ever done more than 4 hours of time/day...