SaTima-78 wrote...
Gold challenge is way too hard for me
Damn!
I felt the same for a while and played mostly silver. Recently I decided to stop promoting since I have a pretty good idea of the builds I like. For the last few weeks I have been playing my level 20's (mostly Adept and Infiltrator) on Gold. If you have a level 20, you have some awesome powers. If you are new to the game it can take a little while to unlock and level up decent weapons.
However that said, the main thing is you learn strategies like placement on a map, using cover, using powers in conjunction with others (i.e. biotic detonations, tech bursts). At the end of the day you can still be a good player by being smart and the more powerful weapons will come with time/credits/unlocks.
Do what I did, get to level 20 on a class you like playing, and simply go play Gold. The more you play the easier (generally) it becomes. You'll find, like with most things, the more you do it the better you become, the easier it is.
Believe in yourself and go have fun!!