Curtain rail help

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How easy/difficult is it to put up a curtain rail? Handyman is too £££ and Hilary's is like £100+ for curtain and rail installation.

I have minimal DIY skills - literally just flatpacks, painting etc.

It's a small bedroom window, we have a blackout blind already but sunlight comes around the gaps and wakes my little one so want to put up curtains to help.

Without knowing how you'd have to fix it, it's difficult to say. Old house with solid stone lintel, tricky. Concrete lintel behind the plaster, also tricky. You'd need a hefty drill, rawlplugs, etc.
But if you have a wooden batten on the wall above the window to screw into, like many modern houses do, it's a lot easier.
What's it like?

Wooden batten, the previous tenant took the curtain rails, but they had a curtain track before. it's a modernish flat, circa 2010 or thereabouts.

I'd only be hoping to pop up a slim metal pole, approx 115cm plus the finial (?) (Star shape bit on the end) with a midweight short drop curtain. (To hit the bottom of the window, any floor-length curtain will get covered in fingerprints in no time)

You need a drill and a spirit level. Other than that, no particular skill is required

Go for it, OP. Borrow a drill, Few YouTube videos later, and you'll have a skill for life!!

Ok great thank you, I am hoping it will be fine, really can't afford hundred + on what appears to be a smallish job.

(I have a temporary travel blackout blind on a tension rod, but it's not really something you want forever as it's a faff and looks a bit of an eyesore!)