It isn't hard to do at all but if you don't have a lot of kits under your belt it can be hard. Those royal plans also come with the instructions so it's just building a kit you have cut yourself. It depends on the plane itself if you should use a kit cutter or not. I don't. A kit cutter only cuts the ribs and formers. You supply your own stringers and sheeting anyway. The tools required to cut a kit are a scroll saw and belt sander. Harbor Freight. A can of spray mount glue, a crafts store. You just glue the templates onto the wood then cut to the outside then sand to the lines. Now you have a kit. I buy my wood from National Balsa or Lone Star Balsa. Some plans today no longer come with any form of instructions so the builder is on there own. There are a lot of tricks to cutting your own. Gang cutting ribs is just one. I use two sided carpet laying tape and just tape my wood together or use the spray mount glue then cut. When done I use a heat gun to soften the glue to get the parts apart. In this day and age cutting your own and building from plans is one of the only ways to get the plane you want. Kits have been replaced by ARFs. If you decide to give it a try just ask for help here on RCU. I often even build the same plane at the same time with others and we can help each outher out with email and photos. It's fun.
Gene