If you are the only game in town, you should have enough money to buy a laminator. If you don't, you aren't charging enough money for your
signs. Laminators are, relatively, cheap. Your unlaminated
signs are only going to last a year or two at most. Laminate them and they will last 3-5 years. Right there is a value difference to your customer. Instead of only selling cheap for sale
signs, you can be selling "permanent" business identification
signs. The price is much higher for those.
If you are unwilling to ask someone 60 miles away top help you (are they really a competitor at that distance?) you should form a relationship with one of the big
sign supply vendors in your area. Someone like Grimco or Glantz or any of the other big ones. The kind of distributors who run a delivery truck to your area. Make an appointment to go to their location and meet your salespersons. You can touch and see and feel the materials they have for sale. You can learn about the different materials and their intended uses. You can see the substrates they sell and learn what to use when (hint--if you're using coroplast for every
sign you sell, you're doing it wrong). You can get a print catalog from them so you can actually see all the materials listed in one place and be able to compare them to decide which one to use when.
Learn how to use Youtube. There are innumerable videos available on how to apply vinyl. And practice.
I had already been doing
signs a long time before i bought my first printer, and already knew how to apply vinyl. And when I first started, I used an intermediate non-air-egress vinyl with laminate, and with my employee was able to successfully apply full bleed vinyl to 4x8 panels using regular squeegees. No bubbles. But it took way longer and was much more difficult than using air egress vinyl, and then when we got the Big Squeegee, it was even that much quicker.