Looking for the best way to paint a beveled door? It’s easy! Start with Area A, using an angled brush to paint all recessed areas. To prevent brush marks on the larger, smooth areas of your door (B-E), line the recessed areas with painter’s tape. Next, move on to Area B, painting each subsequent area in alphabetical order. Use a brush or roller, making sure with each stroke that the fresh paint you are overlapping is still wet. This will help to avoid paint streaks.
The Best Tips for Cutting in Paint Where beginners run into trouble is cutting in along ceilings, moldings and other areas that require a perfectly straight line of paint. We'll give you some tips and pointers to help you increase the speed and improve the accuracy of your cutting-in technique. http://www.familyhandyman.com/painting/techniques/the-best-tips-for-cutting-in-paint
I get a roll of packing tape, and roll out a foot or two touching the carpet and going up a little over an inch of the baseboard. Then I take a smaller putty knife and push the top of the tape down between the baseboard and the carpet, I continue working my way across the whole area to be painted.