if the gauge is right you have made most of the step. Now the look has to be right, too. But that will have been your first concern.
Now my only question is: will it fit the same? Well, if the stuff you make becomes less stretchy then it might not. Or if it became more stretchy and starts hanging.
I just had the strange problem of knitting a jacket with some very different sting. The fit is perfect but it is VERY light. Now the jacket became relatively fluffy which is a funny effect with the Norvegian style it has. Just had to get used to it - and if you concider all those point... or just some of them:
the main concern is the size and then happy knitting.
My way to go about it is to either recalculate the whole pattern to my gauge (least favorite) or to use different needle sizes. Those can do amazing differences.
Or to knit a different size instruction than what I come out with. (means the stitch count of size S but the inches of size M for example, if my knitting is bigger than the instruction.
And, never mind: if it doesn't come out as you want it: rip it out!
I just frequently measure the width and size on my first piece to know, if I am going terribly wrong.
Just do it, have fun! Learn something new!