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You need to be careful about the current draw of the induction. If it is less than 13 amp it should be fine on a normal socket. If you have a specific cooker circuit you need to know the rating in amps of that circuit and check the induction is below that before connecting. You also need to check the rating of the cable you use if it's not supplied with the hob.

You can use ohms law to calculate the amps based on wattage if that's the supplied figure for current draw.

Depends on the power requirements of old vs new.
If they're the same then probably DIY.
If the new one is higher then it may need a 32A circuit for example, which may be new wiring from the consumer unit, and likely a sparkie.

Edit: beaten by Airhead, and I'll always defer to him on this stuff :D

If the induction comes with a plug attached, it’ll be limited to 13a and fine to just get banged into a socket. If it doesn’t have a plug on it, it won’t be limited to 13a and will need wired in by a sparky. This can be quite confusing as often induction hobs will be given 2 ratings - one for when supplied with a plug and a current limiter, and one for the model designed to be hard wired. It seems daft to me to get the ones with plug, but simultaneously I don’t know how often I actually have more than one hob on full what at one time. When you try and draw more than 13a (like with several hobs on full) it just splits the load between them.
How is the old hob connected?

If you haven't ordered it yet then quite a lot of places do half price installation offers on some hobs. I think I paid £35 to AO for installation which, even though I reckoned I could have done it myself, gave me peace of mind.