Best get a pro unless you're comfortable enough to wire your house and generator without burning it down.
My Uncle used to say: "trust the almighty in all cases except electricity".
Do watch the guy work though, you'll get an education, and a good wiring job to boot.
The Generator must be installed with a separate circuit so that it doesn't feed electricity back into the power grid, in other words, kind of a switch circuit so when the Gen's on, no current can flow back into the grid. It can be manual or automatic, the automatic ones are more costly but not a whole lot.