First off WELCOME TO THE HOBBY
When I first started off myself with painting I always did everything on the trees till I got pretty good in my ability to paint free hand and was able to trust my skills then, ANd if you got your kit from a local hobby shop see if there is a group you can join and pick thier heads for with tips and tricks also.
somethings to remember.
1 work in a good and well ventelated place when you paint or glue,if you can have a work area that no one will mess with the better.
2 don't sweat the first few kits cause those will be your learning curve to perfect your skills.
3 Have fun first! if you stress your self out cause it don't looklike the box your not haven fun,we all started some where and made more of our share of mistakes,laugh it off and try again cause you will learn from them.
good luck