Further to Andrew's correct advice just above, if you are not familiar with how to softproof in Photoshop, the attached illustration may help. Go to View>Proof Set-up>Custom and the Customize Proof Condition dialog will open. In "Device to Simulate" select your printer/paper profile. Leave Preserve RGB numbers unchecked. For Rendering Intent, choose the one you will be printing with and check Black Point Compensation where allowed. Also check Simulate Paper Color. I suggest saving those setting as a Preset using a name identifying what condition it is simulating. Then click OK. This condition toggles on or off using CMD/CTRL (Mac/Windows) Y. When active you will have a good appreciation of what will come out of the printer, provided your monitor is properly calibrated and profiled. For monitor calibration, if you are working in dim surrounding light, I recommend a brightness setting in the range of 100~110. This helps cohere the screen appearance with the reflected light you will see off of the print and protects you from making the print too dark.
(edited for typos, 18:23)