If you're not willing to acquire a dichro head then yes, a filter pack will be your only choice. I do, however, highly recommend using a dichro head (especially if you think you're going to be doing a lot of color printing) as it greatly simplifies the process and improves precision. With the filter pack the smallest change in color balance you'll be able to make is usually 5 CC.

For color negative (RA-4) paper a yellow/amber safelight is required, but using a safelight is not recommended if you can avoid it.

You may find this article informative: http://www.apug.org/forums/forum221/...ing-200-a.html