Re: new rigging?
Yep, its easy to do, mast up or down. I'd add to Faster's comment on sewing the lines together. Once you have the lines sewed together, put some tape over the sewed joint to make sure nothing hangs up. Since you'll be doing this with the mast down, it's much less of a hastle to clear a hang up than with the mast up. Just feed the line in tail first.
1983 Lippincott 30 s/v Red Horizon
Regent Point Marina Topping, VA