It's not impossible, but it's hard and you'll die a lot in the beginning, but that's what makes it fun, it's awesome when you get into situations where you solo 3-4 other people or something like that.
Vehicles are mostly difficult to find, but even that gets easier when you know where to look, driving and keeping it in good shape is easy because there's a lot of car parts in industrial areas and all the gas stations have free gas as long as you got jerry cans.
When you log out the vehicle doesn't, and can be stolen/destroyed by anyone so you want to try and hide it.
Same goes for setting up tents, anyone can loot them so you'll want to hide them and not store too much in one spot.