1. The shorter barrel, lighter weight versions of the 1911 are easier to conceal and carry all day than the original steel models with 5 inch barrel. Some folks do carry the full size, which weigh about 38 ounces empty, but I personally prefer aluminum frame and 4 inch barrel or less, weighing about 25 to 28 ounces empty. These are very flat guns and conceal well in the right holster.
2. You have to practice with the gun before carrying it, so that you are completely familiar with the controls and feel of the gun. The trigger pull on the 1911 is short and relatively light, so you must use the thumb safety in a precise manner, and practice control of your trigger finger to prevent accidents.