Anarchy and mistakes may really darken the happy mood. Safe christmas lighting installation for your property and nerves equals less drama and more brilliant effect. https://www.myeverlights.com/permanent-Christmas-light-installation/
First of all, mix and match light strings with different amperage and voltage ratings. That is the formula for a blown fuse, or at best a blacked out block. The label serves more than just flimsy wrapping; check those specs before turning anything on. Should one of those grand old hand me down lights turn out to be found in a dusty box, it could be an energy hog and incompatible with more modern low-voltage LEDs. Stick with what is marked for outside use if the lights face the outside.
Run lights or extension wires never through windows or doors. There are several fast-frayed wires, and a frayed wire is literally ready to produce issues. Outside outlets should have ground fault circuit interrupters (GFCI). Should you not know if yours does, grab a cheap tester from the hardware store. Learning about electrical safety from the neighborhood fire department is more demanding than this.
Keep your ground based contacts in good shape. Snow, puddles, and leaks all damage exposed plugs. Raise them using hooks or hangers made for exterior projects. Every relationship should be close but not under pressure. The secret is forceful but gentle.
Daisy knots too many strings together. Although most modern LEDs can run about 20 linked sets, that old string from grandpa’s time is not suitable; maybe five, highest. Overloading trips either fries the whole show or breaks tripbreakers. Check the manufacturer’s website or box twice for actual numbers. Test everything before you run the ladder or roof.
Lights should make one happy, not nervous. Little extra effort during installation makes a tremendous effect. So does double checking every cord and connector. Your house will so shine, your holidays will be spectacular, and you will escape the kind of pyrotechnics you never want on Christmas Eve.