I would send a private message to some of the long timers here. I have not had to have surgery since this experience, (thank goodness!). So I don't have an answer, but I know other people have had complications with anethsia.
As for whether you are ready, that is something only you know. If you are struggling with your 18 month old, think about potty training and a new baby. However, if you are handling caretaking just fine, than it might be something you would handle fine. You are the only one who would know. Perhaps talk to your doctor and your OBGYN to see what their suggestions are. That way you will have their opinions too. I do know that my nephew, who was born 6 months prior to my accident has been a Godsend for my depression when I am able to keep up with him!