If you have all the boolean modifiers on your stack, you can apply them all one by one. Kent has a great computer and you saw on the video how even his is struggling, that’s why he ends up applying all the modifiers. Do a Save As and leave a file before you applied them in case you want to go back. If you have them applied already, try selecting everything in edit mode and M to merge by distance, perhaps you have way to many duplicated vertices. That laptop model is not a huge mesh, any computer should be able to handle it, I’m guessing you have the modifiers active. If nothing helps then yes, the reality is a capable computer is necessary when doing 3D.
