I went over when I had done all the missions available on Silan. I was lvl 57 in Two-handed Sword, lvl 40+ in Crafting and lvl 30s in Magic and Harvesting. I had my Fire and Wrath, Ranger armor, about 1000 hp.
I started off soloing. I quickly discovered my armor/weapons and skills and hp/stam totals were inadequate and I died a lot to the predators. So my first priority was to build up my stats/skills. I also explored a little, ran some missions and generally learned the lay of the land and where I could hunt. I regularly looked at merchant's inventories and bought player-crafted gear whenever I could. I devised little strategies for the various creatures I could fight. I also learned that editing my fighting actions to suit was a good thing too

I joined a guild one week ago. Although I am predominantly a solo person, I also like the guild aspect. The benefits of guild membership are immense, especially if that guild has access to Cats. Guild members upgraded my equipment, gave me cats. Last night I teamed up with a healer, and he took me to areas of the Matis lands I could not dream of soloing at this point. Whereas I was solo fighting lvl 50-60 creatures, suddenly I was fighting lvl 60-70, and even the odd lvl 100 creature (I'm currently lvl 67).
Since joining the mainland my Two-handed Melee has gone from 57 to 67, my One-handed Melee from 51 to 67. My Crafting has gone past 50 and I've split it into Armor and Weapon crafting.
The main point I'm making is, the first weeks of mainland play can be very rough. But don't give up in frustration, because there are ways you can make it less rough on yourself.