Trim Question

First time grower here growin 11 MK Ultra clones. Question i have is would i still be able to trim some of the lower branches and if so should i? space is most likely going to be an issue if they become too bushy. grow area is 6ftx2ftx8ft. any advice and feedback is appreciated.

just started flowering

If they just went into flowering, don't worry about it. They are kinda small, and it shouldn't be a prob. let em be.