It's hard for some, easy for others. It depends on the individual, as I shall explain.

If you have issues with WILD because you fall asleep to easily when using conventional (WBTB) methods (and due to scheduling conflicts you cannot make your WBTB longer), then WILDing at the beginning of the night is a viable option. The trouble with WILDing at the start of the night is that it takes longer to get into REM, so if you have trouble falling asleep (or falling back asleep), WILDing at the beginning of the night is not preferable (because your mind is most wakeful at the very beginning of a night's sleep).

. . . I think I may have misread you.

"I know it is very difficult to have a WILD after going to bed."
vs.
"I know it is very difficult to have a WILD right after going to bed."
The second (how I read it, and based my reply) is consistent with your title... If you meant the first one (as in, "it is hard to WILD after getting several hours of sleep"), then I'd tell you that it is quite easier to WILD after getting 5+ hours of sleep! It's recommended!

At any rate, the payoff is higher if you WILD after sleeping for a while. During your first sleep cycle (at the beginning of the night), you get less than 15 REM minutes. During your last sleep cycle, you could get up to an entire hour in REM! Depending on how long you sleep, of course.