well, you sound a little as if u meant that weight is the only issue, and not a big one at that.
weight is is a HUGE issue
heavier aircraft accelerate more slowly and slow down less quickly, this lag in speed response can already kill you easily.
having set that, here's a list of things that are different enough that you would not be able to land a 767 without damage.
-point of view. You will be significantly higher, therefore you can very easily misjudge your flare and fly your 767 into the ground, or float over the runway, therefore landing long, and therefore, increasing your already great risk of overrunning the runway.
-the engines are turbofans. which means they take time to spool up and spool down. you need to have had experience in large acft to anticipate power needs. (stall into the ground, or too high landing speed, again, not good for you)
-flaps/ slats/ spoilers/ brakes and reverse thrust. they are all different. in a cessna, at x speed u can lower x degrees of flaps, but in large acft, all that is calculated before each landing depending on various factors. In a cessna, braking is pretty near braking in a car. In a large aircraft, put on the brakes to hard and you will blow tires. there is technique for that too. reverse thrust is not just pull the levers until they engage, theres procedures, science and art behind that too. Without proper training, you will most likely either overrun the runway or blow some tires.
those are the three great factors which will deter you from making a successful landing. There may be more I might of forgotten to mention or the other factors are just not big enough to affect the outcome of the landing.
if you know how to land a cessna, one can say you have your principles, like flaring, glideslope etc, but that does not mean you can successfully land a larger aircraft.
just means you sort of know what is involved, in a genera kind of way, but have nearly no idea how to accomplish it properly.
with a little luck, you might succeed.