A cutter is a device used to remove the sealed tip of a cigar, which allows you to draw air through the cigar. Numerous types and several styles of cutters are available. Smoking stimulates saliva, so it you hold the cigar in your mouth, it will start to get soggy, clogging the air hole and ruining the draw. A high-quality, properly aged cigar will smell nicer to others than a cheap stogie, and it usually leaves less residual smell in curtains and fabrics. You may improve your chances of smoking in the house if you buy premium smokes.
Several things distinguish a tobacconist from a mere cigar retailer.
Until you understand enough to know the exact brand of characteristics you want, you'll benefit from being able to buy cigars in person. The pinch test is an easy way to check the construction of your cigar. It should feel firm, but not hard. If it feels like a piece of wood, of it you feel a spongy spot, choose a different cigar. This used to be a fairly common practice, although fewer retailers are now using this method.