In my basic obed class, we had a couple like you are describing you and your DH. It was a mess. One dog was focused on Dad. The other dog was all over the place, focusing on Dad, on Mom, the other dog, etc. Good luck!
I am hoping we aren't THAT couple.

It wasn't bad this last class, and I think it will get better each time. Fingers crossed!
am I being too ambitious thinking we could do 8 weeks obedience class and take the CGC test by the end of the class? .... pup is going to be 7 and half months...
I don't think it is too early. Duncan was born July 3rd, so he will be about 9.5 months on our test date. As long as you have good focus and great treats, I think it would be fine.
The report of the second class:
We got there a little early and there was another class going on with reactive dogs. We waited outside (despite the chill weather - hey, it may be Florida but we've had a windchill that has the Snowbirds shivering) somewhat patiently. There was also an agility class starting outside and the dogs were showing up. Duncan wags his tail at all passer-bys. Pierre is on the end of his lead, trying to touch noses with one of the Goldens in our class.
A Corgi and a fluffball come up, heading to agility. Wait, fluffball? I look again. It is a VERY fluffy Sheltie. A TINY fluffy Sheltie. The lady wasn't completely friendly when I asked, "How old is your Sheltie?" Then she saw Duncan and smiled with warmth. "Four years old. Oh, yours is a little guy." I smiled and nodded. Hers was still littler. "How much does she weigh?" I'm not sure how I knew it was a girl - she just looked feminine. "Nine and a half pounds. Have a good night!" Off she went to her class, leaving me to stare at the tiny little girl. Duncan is little, but she was truly tiny.
Anyway, in to the class! I sat maybe 9 chairs away from DH and Pierre, around a corner in the seating arrangement (three side of a very wide rectangle). Everyone has plenty of room to work their dogs. Honestly, I don't remember everything like I did last time (it has been a few days since the class), but here are the important parts:
The boys were fine with a separation. No whining or anything. Pierre was very intent on the door, but they would have passed if that were the test. I think I was more traumatized than they were.
Duncan's sits and downs are really good! I will continue practicing and adding distance.
Pierre was playing coy with the instructor when she tried to pat him down and check his teeth and paws. Duncan fed off this and wasn't as shy, but wasn't as well behaved as I know he can be.
Duncan's stays were impeccable for the first 5 minutes of me practicing them. He got weary, though, by the time she had gotten to us and was not listening. This was the last thing we did. He REALLY wanted to just go play with Pierre.
Loose leash walking is better with a shorter lead! I didn't have one at the class and he kept stepping all over the lead, as I was trying to balance everything and keep him engaged.
Homework/notes:
-Sit across the room from Pierre next time.
-Shorter practice sessions before "go" time.
-How do I prevent Duncan from being a "Hoover" dog when on loose leash? He wanted to get all the loose treats!
-Work on touching Duncan's ears more often.
-Try not to tell hubby what to work on because we have different methods and e won't listen anyway.

-Get better treats! The chicken hotdogs gave him loose stool, so we stopped. The sweet potato fills him up too fast. Looking for something better...