Heroic Space Missions arent too hard. They are a challenge if you never did them before, but after completing them a few times its just as easy as any other space mission. Basically the key to finishing a heroic space mission is timely use of invul and blast. If you cant figure out the timing yourself watch some youtube videos.
As a player with max space reputation and Hyperspace Legend title I can truthfully say "NO THEY ARE NOT TOO HARD!", I can do every one of them with all side missions no problem. Just accept the challenge and l2p.