Building a Guillows kit is just like building any other model airplane kit. Some allowances are made for handling smaller, lighter wood and such but the basics of getting good, tight glue joints, alignment of parts, and final fit and finish are what sets some apart. I have seen some that are works of art, and some , not so much. Even the smaller, less expensive kits can be made to fly well, or take advantage of the molded plastic detail parts and build a nice static scale airplane. Almost all of their kits are laser cut now I think, and if you shop around the internet and eBay deals on older kits can be found. Just like in stunt, it's the builder that makes the final product and how it looks is up to them and their skills and efforts. Pick one or two fo the more simple kits to start with, just like you were 10 years old again and don't be embarrassed about it!! You do have a learning curve ahead of you, and just now big it is , well, there is only one way to find out!! There are FB groups for stick and tissue modelers and at least one just for Guillows kits. I suggest you check those out.
Type at you later, and HAVE FUN,
Dan McEntee