Upgrade my micra

So I acquired my micra at 92k miles as a first car. It wasn't in the best condition when I got it, but long story short I want to make some changes to it as I want to make it last.

Would anyone be able to send me links for a repairs manual, with all the specifications for a Nissan Micra K12 SE 1.2.

As well as this I'm feeling ambitious and want to possibly swap out the engine sometime soon. Does anyone have any recommendations or ideas as to whether this is a good idea, if anyone has any experiences or just general tips for this. And further suggestions are welcome.

All opinions are welcome! ?
 
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