Consistency in tightness

[CafeAlaStef]

I"m a super beginner, I just started knitting a couple days ago, and I found that I"'m having a very hard time keeping consistent tightness. My main problem was that i had been making the yarn so tight that i couldn't get my needle under it so i had to keep unravvling everything. So i've been trying to do it looser, but some are looser than others and it makes for a very messy looking project. Any tips on how I can make sure everything is nice and equal?