My New Rem model 11

My dad just handed down to me a Remington model 11. After a inspection I have concluded that it needs to be cleaned on a professional level. looking at it I can see a few rust spots and some build up and maybe a few specs of glitter inside the receiver. I have watched a few videos on Youtube on dissembling it but I am still not 100% I would be able to do the job properly.

I am new to owning this and I am wondering:

Cost to clean it

Any questions should I ask the gunsmith

or should I take the leap of faith and do the job myself.

here is a pic



If there is anything else that i left out please tell me.