dude they will let you come in the kingdom but without your degree attested they will not register you with the council and without that you cannot apply for the iqama, further you will be unable to go back since you would probably be on a a single visit entry visa. that means someone will have to get your degree attested in your country for you... save yourself the trouble and get the degree attested yourself along with other documents like, your experience certificates, etc ask someone who has come on a similar work visa recently. since the above mentioned is true for doctors.
more importantly work fast since you have only 3 months to get all papers once your passport gets stamped
feel free to contact me if you want more info.