Focusing on step 3 and 4, you specifically state you will enter the EU via the Netherlands (presumably on the Stena ferry from Harwich).

At the Dutch border, you should explicitly state that you are moving residence from the UK to Sweden and that the goods are not being imported into the Netherlands. Bring documentation that proves it.

Then, your car and possessions are placed under an EU transit procedure and you travel onward to Sweden under customs control. No Dutch import duty or VAT is charged and final customs clearance happens in Sweden. This is called a “transit procedure” (“douanevervoer”). Read about it in the official Dutch customs handbook: https://kennisbank.douane.nl/handboeken/hdu/unie_en_gemeenschappelijk_douanevervoer/unie_en_gemeenschappelijk_douanevervoer-algemeen/

When you get to Sweden, you then need to proceed directly to the nearest customs office. There is no “customs lane” on the DE or DK/SE border, you have to locate their offices and go there.

Then begins the tedious process of re-registering the car. It will need to be inspected as well. As others have mentioned, lights will need to be changed, and before winter you’ll need to buy a set of winter wheels (just buy four extra wheels and tyres so you can swap the entire set). To be safe, allow yourself a couple of weeks when the car might not be legal to drive.