Im new to all of this completely with that being said Im having a hard time pulling the trigger on a sewing machine for a new leather dog collar/accessories business. I'd need thick as in 8oz leather for large breeds primarily. Im circling around the Cobra class 4 and others in its class. I was completely convinced I was going with the Techsew 5100 until I realized there wasnt that much multi media presents via troubleshooting and saw several comments that the manual was lacking. I think one of my biggest anxieties is also learning on the job. Big investment for a trade Im not famillar with. Only sewing by hand so far. Any help is much appreciated. Thanks Stefanie