Henry's is a great adhesive company. They package adhesive for Armstrong. You have some very serious questions here, let me ask you this ? can you afford to replace this contract, and redo the job. If not don't do it. If this was your house it would be ok, it doesn't sound that way. You need a professional! Gue down carpet and seams are not hard, but this job is not the one to practice on. PLEASE HIRE A PROFESSIONAL.