We’ve just been in/are in a very similar situation. Not a rescue, but a puppy came up for free very unexpectedly, and we’ve had him 2 weeks. Like you, I’m the one at home all the time (self employed), with DH also self employed but working out of the home.
I can honestly say that the last two weeks have been a massive rollercoaster, and mentally, I’ve felt completely on the edge most of the time. It’s been like the early days of having a new born (but worse!), and I feel like I’ve got post natal depression. Had a massive melt down on Christmas Eve and told DH that I can’t be the only one left to deal with pup day in day out.
if you’re going to get the puppy, make sure to have very clear conversations with DH (and DC if they’re old enough) about who is responsible for the pup at certain times (eg, as soon as your DH is awake in the mornings, will he take the pup out, feed it, make sure it’s been to the toilet etc). Will he get up in the night if pup is crying or to take it out to toilet? Will he be doing most of the weekend care, to give you some respite? Will he be able to take time off work to break up the week for you?
We hadn’t discussed any of these things beforehand, leading to huge resentment on my part, many tears and regrets.
I pretty much laid it on line the other day, and told DH that we can’t keep pup, if I’m the only one doing the care.
Your advantage is that if you’ve grown up with dogs, you’ll know the basics. I’ve never had a dog, so it was a massive shock to the system!
Good luck on your decision!
If you get it, I’d advise coming over to the Puppy Survival threads on here - lots of lovely people in the same situation, and some good advice.