2 folks shooting at same animal at same time, isn't un heard of at times, to increase a kill,
but most folks that hunt want the kill to be of there own, and that's why its the more common deal

and its very hard many times to get twp guy on same target at same time and time the triggering at same time

Now as for CAN you kill on public land
since about 70% of hunters tend to hunt public land and kill the higher percentage of animals every yr(on average in most states)
yes it can be done
the main key to all things is being in the right spot at the right time
that can be public or private or?
again, talking to game wardens in area's you wish to hunt is one of the best tools you will have, use it
can be done from where ever you are at
be polite be honest and ask for help
be surprised how much info a warden can offer if you approach it right!
NOT all wardens are as warm to offer help as some, but most are OK folks I think

as for locations of hogs, MANY times Hogs are considered pests, and as such, many land owners might WANT the help to control numbers
But many might be less likely to allow less experienced folks on there lands, due to worries about safety and liability concerns,
some states offer permission to hunt slip/forms, that when a land owner signs and hunter, it relieves the land owner of responsibility if you get hurt
BUT your liable for damages!

I have hunted about 15+ different states on do it yourself hunts, and every one to date has been a success for me, but I plan a lot and do a LOT more research than many are willing to
but as I said, hard work and efforts put forth can have great rewards

and that is mostly up to you

the earlier you start things on planning, the higher your odds IMO, IF you stick with one area and fine tune
also think too, some times paying for access, makes a hunt/kill more likely, if that is the main goal
spending say 500 and going home empty, or paying an extra , say, 200 and having a kill,
some times is worth it to some

hunting is hunting, its a skill, you learn over time and will get better IF you learn s you go and put in time and effort to do so
half A$$ anything and you get what you give