A mum has revealed the best way to decorate Christmas trees to avoid having any dark and dingy patches – by carefully applying thousands of lights in a specific pattern.

Kelly Fitzsimons, 31, from Ireland, went viral on TikTok by showing how she applies lights to her tree – with more than four million people watching the clip.

In the video, her tree can be seen completely bare before she gets to work on the lighting.

She starts by untangling her chosen fairy lights – a warm yellow string.

Kelly says: “I push the lights into the base of my tree the whole way up the trunk.

“There is no particular way of putting them in, just lay them on top of the branches, and then once you are taking these off your tree they will just pull off, they’re so easy to get off.

“As you can see, I’m not walking around the tree – I’m going from left-to-right, right-to-left.

“Once you have them done, you’re going to go on to each individual branch on your tree in a zig-zag shape, matching each corner underneath.

“I’m doing them a little bit looser here so you can see what shape I do.

“And then you work on the tree from left-to-right and right-to-left – don’t walk around it.

“On your way up to the top of your tree, I do one half with 2,000 lights and the second half as you can see here with another 2,000 – it’s nice and bright.”

Kelly uses a total of three packs of 2,000 cluster lights to perfect her tree, using the handy method.

The clip proved popular, with nearly 250,000 likes and hundreds of comments.

A mum has revealed the best way to decorate Christmas trees to avoid having any dark and dingy patches – by carefully applying thousands of lights in a specific pattern.

Kelly Fitzsimons, 31, from Ireland, went viral on TikTok by showing how she applies lights to her tree – with more than four million people watching the clip.

In the video, her tree can be seen completely bare before she gets to work on the lighting.

She starts by untangling her chosen fairy lights – a warm yellow string.

Kelly says: “I push the lights into the base of my tree the whole way up the trunk.

“There is no particular way of putting them in, just lay them on top of the branches, and then once you are taking these off your tree they will just pull off, they’re so easy to get off.

“As you can see, I’m not walking around the tree – I’m going from left-to-right, right-to-left.

“Once you have them done, you’re going to go on to each individual branch on your tree in a zig zag shape, matching each corner underneath.

“I’m doing them a little bit looser here so you can see what shape I do.

“And then you work on the tree from left-to-right and right-to-left – don’t walk around it.

“On your way up to the top of your tree, I do one half with 2,000 lights and the second half as you can see here with another 2,000 – it’s nice and bright.”

Kelly uses a total of three packs of 2,000 cluster lights to perfect her tree, using the handy method.

The clip proved popular, with nearly 250,000 likes and hundreds of comments.

One person said: “I love lighted trees, this one just makes my heart sing.”

“They can see this tree from space,” another user added.

Someone else commented: “Tell me you’re the most patient person ever without telling me you’re the most patient person ever?! Beautiful.”

“Those lights are so pretty!!!” agreed another person.

One person added: “I cannot tell you how delighted I am I found this video.”

But not everyone was sold.

One user said: “This is beautiful but I’m so lazy so I’m gonna stick with pre-lit trees.”

“Putting the lights on is the worst part of the entire Christmas season,” another person said.

One viewer commented: “That looks so nice but I would have no patience for this haha.”

“Don’t get me wrong it looks epic. But imagine taking the tree down,” added someone else.

For Kelly, lighting the tree precisely is a must-do ahead for the festive season.

"I had an extra set of lights about six years ago when I was doing my tree so I just placed them in at the trunk and I couldn’t believe how bright it made it,” Kelly told Jam Press.

"I am a massive fan of Christmas – it’s my favourite time of year.

“I wish my tree could stay up all year.

“My next project is a garland surrounding my front door."