i concur with bugblatterbeast's thoughts here. If you were shifting fine before (no grinds/difficulty getting into gear) it seems like your clutch may not be fully disengaging. It's also possible the pedal is moving the clutch too far.
Does it go into gear more easily with your foot on the floor, or with the clutch slightly off the floor (by 10mm, 20mm, etc.)?
Either way you can make a pedal adjustment to the clutch in the pedal box, to give it more or less engagement (depending on what you need).
Read through this thread for some more background: https://legacygt.com/forums/showthread.php/spec-clutch-and-flywheel-pedal-travel-question-71531p2.html
Also, make sure your fluid is topped off! I second the recommendation for the Motul Gear 300/Redline Lightweight Shockproof combo.