Best advice I can give you is:

Get any heavy lifting you need to do for the next few months done now.

I had full sternotomy (I had a 9cm/3.5" thymoma) in May. I was not allowed to lift/pull/push anything greater than 5lbs for 6 weeks and then was allowed to gradually increase weight. A car door is too heavy, you'll need someone to open the door for you (I cheated after the first week and just used my feet/legs for moving the door). Mall doors are too heavy, you'll need to use the auto-open or have someone open the door for you. Partial sternotomy may have less stringent rules with respect to weight limits etc.

They will probably provide you with a heart pillow (open heart surgery is done through full sternotomy too) - always keep that within easy reach. You will cough. If you don't have the pillow to hug and stabilize your sternum it will hurt.

Did you have any specific questions?

Cheers,

Brian