Use only insulated staples to hold strings in place, not nails or tacks. The lights could short out and start a fire. Portable outdoor GFCIs can be purchased where electrical supplies are sold. GFCIs can be installed permanently to household circuits by a qualified electrician. Choose tinsel or artificial icicles of plastic or nonleaded metals.
Leaded materials are hazardous if ingested by children.
Never use lighted candles on a tree or near other evergreens. Always use non-flammable holders, and place candles where they will not be knocked down. In homes with small children, take special care to avoid decorations that are sharp or breakable, keep trimmings with small removable parts out of the reach of children to avoid the child swallowing or inhaling small pieces, and avoid trimmings that resemble candy or food that may tempt a child to eat them. Follow container directions carefully to avoid lung irritation while decorating with artificial snow sprays. They contain heavy metals that can cause intense gastrointestinal irritation and vomiting if eaten.