you can switch professions, so just try them all out .... the only bad side is that you'll also lose all crafting skill points you may have earned (however xp are unaffected
)
Tiers for the character and the crafting professions are based on your experience :
- basically, every 10 lvl equals to a Tier for the character and allows you to wear more powerful items, but also to "unlock" new maps. Tier 1 > lvl 1 to 9, Tier 2 > lvl 10 to 19, Tier 3 > lvl 20 to 29 ...
- for crafters, you get access to a new Tier when you have reached 101+ skill points in your profession