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If it's a question of updating the existing kitchen (assuming the kitchen units are not shot) you could try just replacing the doors. Take them off, along with any trim pieces (plinths, pilasters, infil panels and show end panels) and measure them accurately. You can then go to a cutting service like cutwrights who can provide you with cut and edgebanded boards made from a variety of different materials all of a very high standard. They can even make shaker style doors. You can also get matching shelving units made up with the materials they supply.
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You got a short memory..... my kitchen nightmare.
As the others have said.
@Bobbo when have tried to that in the past, found that hinges on the doors didn't line up with the cut out on the units.
Fitting kitchen units is well within the capabilities of a competent diyer.
Fitting a worktop is more tricky and requires some specialist(ish) kit; router with guide bush, worktop jig, biscuit cutter. There is no reason why a diyer couldn't do it but mistakes are costly and these days cut outs for sinks are generally becoming more complex with much lower margins for error.
If you are looking to save money my advice would be to fit the units yourself and get a pro in to fit the worktops.