Okay, focusing on just Fingon in Episode 1, what I see right now is:
1. Fingon is living in the Camp of Fingolfin on the northern end of Lake Mithrim. He learns that Fëanor is dead and Maedhros is captive in Angband. Fingon is frustrated by the division of the Noldor.
2. Morgoth makes a cloud of smoke to hide Angband from the Sun. Seeing his opportunity, Fingon makes up his mind to rescue Maedhros. He leaves without the other Noldor knowing his intentions.
3. Fingon in Thangorodrim. The task seems impossible. He cannot find any way in. He searches the mountains for a secret entrance.
4. Fingon gives up. He sits down and starts to sing and play his harp. Maedhros is close by above him and answers. Fingon climbs up and sees Maedhros' predicament.
5. Maedhros begs Fingon to shoot him. Fingon readies his bow and prays to Manwë. The arrival of Thorondor.
6. Fingon tries to free Maedhros. Instead, he resorts to cutting off his hand. Thorondor carries them away. Someone from Angband is a witness to the escape.
7. Thorondor brings Fingon and Maedhros back to Mithrim. They land in {which camp?}
These events have to happen in this order, obviously, but we don't have to tell them in that order. So, if we do decide to start with Fingon in the mountains of Thangorodrim at the opening of the episode (step 3 here), we would then have to show the other events (1 and 2) in flashback or some other version of out-of-order storytelling. I am fine with that, though I doubt the Hosts will like it. Still, I will suggest that as an option.
Events 4-7 happen back-to-back continuous, so we can combine them into one scene or split them up with other scenes between, as desired. They are each a discrete event, though.