The Petroff is very easy to learn, as I said I can give u some lines.
1.e4 e5 2.Nf3 nc6 is also easy if you do what I do, which is:
1.e4 e5 2.Nf3 Nc6
3.Bc4 Nf6- Ulvestad (I think u know that one)
3.d4 exd4- ...Bc5 Scotch
3.Bb5 Nf6- Beverwijk( see game)
A general question:
Which of those two openings do you think is the easiest to learn ?
I think e5 is by far the easiest opening to learn. And the most difficult on the same time.
First, a study in non-lopez lines, which should allow you to get a playable position against them. Not hoping for advantage, maybe not even for equality against the Scotch and the Italian game, but a position where all 3 results is possible.
Then, find a defence you would like to defend against the ruy lopez. Closed systems is by far the most complicated, but also teaches you alot about chess in general, and you will have an opening for lifetime.
Then the most important part: STICK TO IT. I've played 1.. e5 for 6 months, and only once (out of 9 games with 2+ hours to each player) I got out of the position worse. And there I got a position where I could outplay my opponent. He played a few mistakes, and then it was black who fought for the win. Both players made a few mistakes in time trouble, but I won in the end. Only once the game was drawn, and that was definetly because of my tactical abilities.
Here is some tactical puzzles from my e4 e5 games as black: