Most times people use a Transmission Service Company to get permits because they are are at a loading point and can not do the leg work themself.
For you since you live in the state; have time to do the leg work; and really do not want to pay someone to do what you can; I recomend going to the office and getting your own permit.You will need to know all the dementions of the load. Do not be skimpy because if you get a permit for 118" and you get measured at 118 1/2" at a scale you may find out how much the DOT can like you. Most states only allow wide loads to move in daylight hours during the week and with good weather. No weekends. You will need 2 oversized load signs; and some red flags. Hopefully you can stay under 12' wide so you will not need a escort car.
The state will asign a route to you that must be used. The only fear I would have buying a permit in advance is bad weather on the day of the move.
Might want to ask what happens if it rains on the day of the move or get a permit that is good for several days in a row. While I can not remember his name there is a NY DOT officer that post on this site from time to time. He may respond to your post if you are lucky. Might want to look at the 2 pages below because this is the laws you will need to follow. Link https://www.nysdot.gov/portal/page/portal/ver-STAGE/transportation-partners/nys-transportation-federation/permits/ny-permits/repository/PERM30.pdf
| 
