T1 to T1 is not difficult, but it has some differences from the usual welding of Q&T HSLA steels. The biggest is that no PWHT is recommended. Heat input needs to monitored closely. Preheat is ambient (50 F) to about 200F depending on thickness. Consumables are usually in the 110 tensile class - E11018, E111T1-K3, etc. for matching welds. Interpass temperatures shouldn't exceed about 400F. Use stringers, no weaves. Mittal steel used to have a very informative .pdf that had tables and all the information needed, but since Mittal has been taken over, the link has disappeared. I think I still have a copy of it at work, if I do, I'll put it a link up for download. There are a few more or less useful links around, but carefully consider their recommendations, for example Lincoln recommends stress relief by peening - generally not favored by many engineering departments.
http://www.lincolnelectric.com/knowledge/articles/content/20faq.asp#11http://www.thefabricator.com/ArcWelding/ArcWelding_Article.cfm?ID=1636This link contains most the information that is in the Mittal document, but navigation is painful:
http://www.tpub.com/content/misc_manuals_1/TB-9-2510-242-40/TB-9-2510-242-400061.htmAs mentioned in the thread, AWS D1.1 requires a 48 hold on NDE after welding.