To clean a rifle barrel that can't be cleaned from the breech, just clean with a brush and patch normally. You may want to buy a little gadget that acts as a bore protector so the cleaning rod doesn't rub the bore at the muzzle. Some people prefer a fiber glass rod for this reason. Actually, unless you do a lot of cleaning, it probably does not make much difference.
You should only "field strip" the rifle enough to clean it. You can clean trigger groups and the like with a spray cleaner without taking them apart. Clean the bolt face and the extractor with an old toothbrush or copper or brass brush if there is a lot of powder fouling.
Taking a rifle fully apart is not necessary unless something needs repair. The biggest problem in doing so is the little spring you heard hit somewhere in the corner but can't find.