Have you visited an aircraft modeling expositions, shows or shops? They are full with so many different airplanes, helicopters, gliders... sometimes you may even see model ultralight trikes, paragliders, gyroplanes, balloons. Some models can fly with or without a remote control, other are static scale models of real aircrafts. What kind of people are creating them?
Most of them are people like you and me - aviation enthusiasts who love airplanes and flying no matter if they fly in the real life. Most people who build model aircrafts are not engineers, but still have specific knowledge and skills.
So what does it take to build model aircrafts yourself?
Patience and Discipline. Building quality models require careful and patient work. If you rush the details the end model may not look properly or may not fly well if you are building a flying model. The static scale models require the most patience because you have to maintain very precise measurements of each part. The radio controlled models can make you struggle with the technical issues around the remote connection. The free flight models may need many adjustments before they can fly well. It takes patience and discipline to build good models yourself.
Knowledge. I said aircrafts model builders were not engineers (at least most of them) but that does not mean you don't need knowledge. If you build flying models you need basic knowledge of physics and aerodynamic. If you build scale models, better know more about aeronautics and aviation history. But is this knowledge hard to obtain? No, most of it is available for free online and easy to understand.
Technical Skills. No matter what kind of models you want to build you must have precise hands and skills for cutting, measuring, sticking and doing calculations. There are tools which can help you of course - obviously you can use a calculator for doing the calculations. Most of the skills required are not hard to train, but again you need to be patient and disciplined to do that.
Enthusiasm and Curiosity. Some people see how others create great aircraft models and immediately decide to do like them. It's good to be impulsive, but since creating good models is not simple, it's better to ask yourself first - are you really enthusiastic to build aircrafts and curious enough to learn new things thru the building process? Great things happen only when some passion is involved.
How To Make It Easier? If you are just starting now, better don't try building models from scratch. No, it's not that hard, but for a start better buy a kit and build from it. The kits contain ready parts and instructions and you have only to construct the aircraft from them and at the end eventually to paint it.
Building model aircrafts yourself is fun and doesn't require too much from you if you are passionate. Just be prepared and have some patience if you want to gain the rewards of building exciting models.