I had something similar done three weeks ago. Pain very bearable (though didn't realise that nurofen is contraindicated when breastfeeding, and would definitely seek out some sort of anti-inflammatory that's compatible with breastfeeding, especially for the first week or so).
The advice I received was 'A brisk walk, for 15 to 20 minutes, morning and evening'. As I'm a regular gym-goer, my consultant said to do as much as I felt able to do, and the more exercise the better the result.
The other important thing to do is to bathe and moisturise the leg twice a day. I use Bio-oil.
My veins were hideous and I'm noticing a definite improvement, though the bruising is pretty ugly at the moment!
So, in summary two reasonable walks (the mention of the evening one is so that the blood doesn't 'pool' in the treated vein as you lounge around the house at night-time, ha ha), lots of massaging with Bio-oil, and find an anti-inflammatory you can take (I used Ponstan, and didn't think I'd need it, but apparently my vein problem was 'complex', and I had snipping as well as lasar).
Best of luck!