Very nice. The same is coming up for us in the next few weeks. I'm a bit nervous whether it will work out..
Preparation is everything. Try to make everything as smooth as possible. Rake in grass seeds or cover them with additional soil. Otherwise, the birds will eat everything away again.
You can also add starter fertilizer. But I didn't do that.
Beforehand, try with a lawn sprinkler to see if you can reach all areas from outside, if there is no automatic irrigation yet.
Once the lawn is in, then water, water, and water again. But don't turn it into a bath lake, otherwise everything will rot away. In my case, the soil was always moist since putting it in.