Reintroducing young cats

[HaroldMeeker]

Eddy has been in isolation for the last 9 days after major surgery. 5 months old, he has 2 sisters from the same litter. Tomorrow he should be discharged from vets, so we can start reintroducing them.
All 3 have miaowed and chirruped through the door gap at each other, and they spend ages lying either side, smelling. I'm hoping we can reintroduce without too many issues but the girls hated the way he smelled last weekend after his anaesthetic and hissed, so I'm really nervous.
We've got a pet gate to keep them separate when we open the door. I've been watching Jackson galaxy re letting them smell but not see each other, feeding them like that so they associate it with each other etc.
I'm so anxious about it going horribly wrong. Plus we have to do it again - both girls need the same surgery but are too small just now. I'm a wreck. Help! Somebody tell me it will be okay.

Girl cat hissed at Boy cat when he got back from an overnight at the vets because of his smell. I just kept rubbing him with blankets from home and within 24 hours they were fine and grooming each other again.

Oh that's exactly what I needed. Thank you. They were such good buddies. I wish we could have got them back together sooner but poor boy needed to be kept quiet and not allowed to behave like a 5 month old kitten. No chance of that with 2 others rampaging round the house. He's so lonely...