Chances are it will be OK. There will be the odd dud I suppose if you are unlucky.
I had a 4S to pieces a few years ago to change the screen. To do that you have to take literally all the innards out including the battery. I'm not especially dexterous, but I took my time (and photographs of where everything was before I removed it) and it worked fine.
I got the bits from Amazon - supplied with all the tools. Lots of tips in the reviews, and lots of videos on Youtube.
My Huawei is going to need a battery soon. I suspect it might be trickier and the local mender is fairly cheap to I might leave it to him.
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