Not at all! If you do a lot of shipping, you may want to consider a label printer with shipping labels, as that can be a convenient and economical choice. But for people who ship less frequently, simply printing the label on a regular printer works just as well.
Keep in mind that if you're using printer paper, you'll want to protect the label when you tape it to the package, so covering its surface with clear packing tape can be effective and help secure it.
From Shiplane, you can print to any printer attached to the computer you're using.