Why do you need an electrician to install your oven?
If you’re replacing your oven with a like-for-like one, it’s very easy to install. But not getting a professional to install your new oven can invalidate your warranty, so it’s always a good idea to get an electrician to install your electric oven.
An electrician can inspect the existing connection to your electric oven and connect the new one to the supply, or they can connect it to a new supply. You want a reputable and qualified electrician to do this as work carried out by an incompetent person could cause fires.