I've been building for nearly 40 years and there are 18 year olds who can out build me. The best advice I can give you is this;
1. Patience pays off. Take your time to do things right.
2. If you mess up don't sweat it, correct it, if it cannot be corrected, move on and learn from it.
3. The proper tools will always make things easier. Until you have all the tools you want/need, spend half your model budget on models, half on tools.