What is a bonemarrow transplant like?

Not likely.: This is usually done by pbsc harvest or peripheral blood stem cell harvest, after being administered a shot of CSF or colony stimulating factor to help get them in the blood. Then they are administered to the recipient in hopes that the graft will take. There might be some side effects with this, most notably from the recipient, like gvhd, and/or failure of the graft. Both may have nausea, etc.

Giving or recieving?: As someone who has donated bone marrow, it is an incredibly rewarding experience associated with only mild discomfort in the lower back.