Well I suppose if you dont have a bow, never shot one yet, and dont have or never shot a ML then you better have allot of time off to practice IMO.
I think 5 months is enough time to do it. But you better hit it hard and already know were your going to hunt and approach each weapons capibilities.
Personally I have all three weapons and have shot and hunted all three. Its my opinion this should be a personal requsite to putting in for a Multi.
If not, like I said above, you better have lots of time and a good source of income for this season.