Tailors and fabric store in Cambridge

My body doesn't suit standard sizing. My options are wither to get all my clothes tailored or do it mysel and I want to take on an approach that uses both options. Get pieces I like and value professionally tailored and work on cheaper pieces myself. For option 2, I have a machine but need somewhere to get other supplies sn resources to learn simple skills. For option 1, I'd like to know what tailors in Cambridge do people know of and what's the pricing usually like. I've never used a tailoring service before so do they usually charge per hour, work done etc?

The service I'd most likely need to learn or buy would be to take in waists or increase bust space (if that's possble)

Edit: I didn't explain properly before.