Managing your own renovation

If you are not moving walls etc its a relatively easy job. Assuming you have access to a decent plumber for gas/water connections.

Here in Australia at least if you take a set of measurements+ design sketch to a cabinetry place they can generate a plan and 3D drawing quite quickly.

I've done it in the past myself roughly in order below.

Take measurements - Do a rough sketch. Get quotes and settle on a supplier/design and check delivery times. Know the size of any inbuilt appliances before hand.
Isolate services, ie gas
Gut existing kitchen.
Plumber - move gas/water if required.
Move/install power outlets if needed.
Patch walls
Kitchen supplier does a final measure. (Sometimes can be done earlier to reduce delays if not re-sheeting walls)
Supplier or yourself install cabinets and cuts benchtop to suit sink/hotplate etc.
Plumber returns- hookup.
Install tiles/splashback.
Fit off electrical.
Paint walls.
Install floor coverings.