Replacing a gas cooker

[Butchersdog]

Seems I will soon need to replace my existing gas cooker and I'd like your views on 2 issues, please.
1) both the gas and electric connections are plug-in so can I replace the cooker myself?
2) existing unit is 535mm wide - I expect I'll need to go for 500mm next. Any recommendations? (or warnings...)
Thanks,
John

 

[Iamchamps]

Any gas appliance should be checked by someone who is gas safe when installing.

There are lots of 535mm cookers on the market.