Photoshop help...I know this could go horribly wrong

[Sully]

So I know this could come downhill really fast but I figured I'd ask. Does anyone have any experience adding quality back to photos using Photoshop or some similar product? I have a picture of my dog that I may want to get blown up in the future that was originally taken on my fiance's iPhone. But she does not have the original (I though photos backed up to iTunes but what do I know). She is obsessed with editing pictures on the phone using shitty free editing apps that completely destroy quality as we found out when we got a bunch of photos she had edited printed out. (maybe it was Walmarts fault but I blame the apps).

Either way, the only copy of the photo I have has pretty bad lighting and I fear it'll be pixelated as f*** when blown up. I'm not looking to hire anyone as it's not really that worth it to me and I'm not looking for someone to spend hours editing each pixel but if there was an easy way to plug it in and edit the picture, I would really appreciate it. I do not have Photoshop or know how to use it which is why I ask.



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