Machined model engineering kits have been around for almost two hundred years. They have everything you can possibly need to assemble the intended machine. These packages may seem like they are aimed at those with a vast amount of engineering knowledge but this is not true. They do however require the assembler to have a bit of technical background. If the experience rather than the result is your preference do not worry.
The technical skill will come in time but the joy of going through the motions is unmatched. You can even have experience with family or friends to make it even better. If however, you decide to take it seriously you must prepare for a great task. Your main objective in this instance is to get the machine working as it should be. This involves a lot of work but with patience, you can eventually be successful.
Packages that are not machined come with very little help. They have no instructions or guides and sometimes no precut parts. The machined versions, however, come fully outfitted and thus makes the job of completing the task a much easier one yet it is still hard enough to be fulfilling. All the packages, however, do come with all the parts needed no matter how big or small. It is therefore up to you to figure out how to use them.
The plans should help you but you must also have the necessary tools. Depending on the nature of the model you may also need power tools as well as manual ones. Assembling engineering kits is like a community project. You can gather information from online communities or anywhere else. At the end of your project, you are sure to earn new friends and experiences.
Do not take these for granted they are two very useful assets that will earn you much success in the world of building model projects.