A dilemma

I have a dilemma - a life dilemma. And I'd like some advice.

My hubbs and I have been working towards me becoming a stay at home mom for roughly 18 months. It's something that is important to both of us, just not easily financially feasible. Our plan had been to try for baby # 2 around the time Colin turns 3. Baby would be born close to the time Colin turns 4, so he'd be starting pre-school soon after that. This would make my transition to a SAHM easier and I'd be available for Colin to help make his adjustment to school easier.

Then today I was having a rough day at work (picture being told working major overtime was "no big deal"). My hubbs casually mentioned that we've finally reached a point where I can work part time (nights and weekends) and still make ends meet. Yay!

But here is the dilemma. In order for us to be able to afford me going from FT to PT, we have to stop sending Colin to daycare. We have, hands down, the BEST daycare provider ever. She's amazing. Colin loves her. He loves the other kids. I'm hesitant to take him out of her care because he has grown leaps and bounds with her and I'm afraid my care won't measure up (she's got an education in child development. I do not.). Also, I've been working FT since 8 weeks after Colin was born. I'm not really up on all the Mommy and Me classes happening in this city.

I'm nervous about uprooting our schedule. Colin really doesn't respond well to changes and this would be a huge one. Plus...it breaks my heart to think of him wondering why he can't see his friends every day.

So I'm wondering if anyone who has been through this (or a similar situation) has any advice for me?