Very doable - by extra experienced sailors.
1) practice sailing in Long Beach inside the breakwater then
2) Practice sailing outside the breakwater then
3) sail Long Beach to Newport Harbor and then back then
4) sail Long Beach to MDR then
This post can not go into the major safety items you need to have on board when going in an open small boat in the Ocean, but imagine the boat swamps and you are in 58 degree water for 4 hours.