check your 'shrink to fit' type options and make sure they're off. also make sure your printer knows it's printing on A4 instead of 8.5x11. sometimes the program you're using knows, but not the printer driver.
scrutinize and triple check every option box you see along the way.
i assembled pages for my first build. any build from here on out i'm going to print full size at a print shop. the margin for error is huge trusting a wobbly tape job.
surely people have success with the method, i just wasn't one of them.
best of luck, document your progress, and PLEASE share your results and experience. it's fantastic seeing people building kites.