It's hard for me as well, but as I've lead more teams I've learned how to delegate more. It's okay to delegate hard tasks to more advanced members of your team, if it leaves you open for more questions and the ability to support others. As far as the client is concerned, I'm the representative for all of the backend work that's been done, so according to them it is I who take ownership for the whole thing. Therefore, the best thing for me to do is ensure that my team who is doing the actual coding work is as supported as they can possibly be, so they can get the most work done in the shortest time frame.
