Nailing J-channel under existing siding

[skeezix]

Hello, We are working on a window project replacing 22 windows under vinyl siding. Unfortunately, the existing siding covers the 2-inch nailing zone that should be left around the windows for the flange. I am hoping to cut back the existing siding and install a 2-inch trim. If we do this then we have to install new J-channel because it will need to be longer than the existing j-channel. Removing the J-channel and cutting back the siding is the easy part. What I can't figure out is if there is a way to nail the new j-channel in place because the nailing flange will be under existing siding. Hand nailing would be very risky. Do you guys know any tricks for nailing the j-channel under existing siding? Or do we have to peel off the existing siding around the windows?

[pushkins]

The only safe way to to the J channel is to remove the siding around the window and re install once you have it done.
It will make the window install much easier as well.

[tinknocker]

i agree with the last post, taking off the siding will be much easier and faster in the long run.