Need help with pattern modification

[GLock18]

Found a pattern that's close to a jumper that I once saw on TV, tho I want to make some changes like using smaller needles for a tighter knit (thinking US 10.5 or 11 instead of the US 15 it calls for), also a ribbed v-neck like in the show. Ive never really changed a pattern before.. Any tips? Photo below

 

[phoebe.ash]

If you're going with smaller needles, just keep in mind it'll affect the sizing and gauge, so maybe swatch first and see how it behaves.

 

[GLock18]

If you're going with smaller needles, just keep in mind it'll affect the sizing and gauge, so maybe swatch first and see how it behaves.

Good thinking, will do this for sure..

 

[StitchWitch]

Nice choice with the swatch. It's a smart idea to see how the yarn performs with those smaller needles before you really get started. That way, you can make any adjustments to the pattern if necessary and steer clear of unexpected issues down the line. By the way, are you planning to use the same yarn weight?