Do as Helles says, it's a really easy job and it will give you something to do
It's only easy if you know what you are doing. Seen too many DIY attempts where mortar is smeared everywhere. Used to be my job so pretty confident but it is boring and time consuming.
I have to disagree, boring i know but it's a piss easy job so please don't make it sound worse than it is
if raked out well you can use a mortar gun, a bit like an oversized silicone gun. overfill the joints and let it dry a bit then tool it in. the excess will fall to the ground almost dry. then throw a custard pie at your local give way sign
ps. if diy. scaffolding not mandatory but recomended
Thats a very lazy way of doing things clown, you should know better