most important before you even attempt to clip their nails is to get them comfortable with you handling their feet/toes. It will make the experience much easier and less stressful for both of you! If you use nail clippers, be sure that you do not cut the quick--on light colored nails, it will be relatively easy to see. I always take small snips so that I do not risk cutting it. If you do cut the quick--it will bleed and it does hurt! Keep a supply of Quikstop styptic powder on hand, or in a pinch, you can use cornstarch or flour even to stop the bleeding, just apply to the nail tip to clot the blood. If your boxer is not thrilled or cooperative, go slow and do one nail--praise like crazy, try for another, praise, etc...even if you only get one foot done, it is best to end on positive note than to end up wrestling your dog and stressing everyone out. If you are worried about your first time, schedule to have your vet or a groomer show you how to do it the first time, then you can maintain them at home on your own. Most vets charge only a minimal fee to come in for a nail trim. I do not have much experience using the dremel tool to grind them, but I have heard it works well. I would think the same idea to go slow and at first let the dog get used to the sight/sound of the dremel tool would be best before attempting to use it on the dog. Good luck! Depending on your dog's age, etc you may not be able to trim much initially because the quick may be long--just trim the tips and gradually over time you can trim more and the quicks will recede. Walks on pavement also help "push" back the quicks some and keep the nails worn down.