Take the Narita express to shinagawa station and transfer to the Keisi line (spelling)... It's a smaller station than Tokyo center and a bit less crowded. To get to the Keisi line you do have to walk outside of the main station (jr line) and enter the Keisi line station (local subway). One way is probably around 40 usd and takes maybe two hours max. It is also well marked... Due note that the local subway (Keisi) does not accept credit cards at most stations and kiosks.