Instrument training is generally done in three phases and in this order:
1. BAI: learning how to keep the blue side up and the brown side down with reference solely to instruments.
2. Procedures: Departure, Arrival and Approach procedures.
3. X-country: putting it all together to fly in the system.
If you only do part of it, at least finish the BAI, but beware, even instrument rated pilots suffer from high accident rates due to continuing VFR into IMC. So completing BAI training might have the seemingly paradoxical effect of making you a less safe pilot due to false overconfidence!
The logic behind this assertion is that when I fly IFR, i.e., in the system, regardless of the weather, I am more "tuned up" for the flight. So from pre-flight to landing my brain is in the full ON state and I find that I fly way more ahead of the airplane than I do under VFR. From rotation to visual on landing I am flying on instruments, even when there is not a whisper of a cloud along my route, but if I do happen to venture into IMC in this state it is a non-event and no sudden transition to instruments occurs. Of course when IFR in VMC I also keep an eye out for VFR traffic but the instruments have the bulk of my attention.
If you do finish the rating, I highly recommend that you do what my instrument instructor told me to do with it: use it, use it on every cross country, even if the weather is severe clear along the entire route. So that's what I do. The proficiency that you will maintain by doing so will make you a safer pilot, regardless of the weather.