Put in an Ikea kitchen a number of years ago. Was a surprisingly painless experience. No sales pressure, helpful design person, flat pack easy to assemble and sturdy. I bought a worktop elsewhere on advice of a friend in the trade and got a professional to fit it. All the rest completed by Sealhusband and me though, without falling out.
I was very surprised when I read it but it seems that that is the recommendation. Do you have a cooker hood hp, and if so I guess its only the same width as the hob? I really don’t want a wacking great cooker hood if I can get away with it!