Pronounciation of Lrr?

[KettleStrange]

I've been attempting to get my mouth around vrrtep and lrr for the past 15 minutes or so, and while I grasp the sound, I can't seem to duplicate what I'm hearing on the Tree of Voices software!
Does anyone have any tips for pronouncing the 'rr' that doesn't make it sound like I'm gargling rocks?

[VathRas]

I'm not 100% sure, but that's how I pronounce rr sound:
1. I put tongue on the palate, stick it to teeth (from inner side)
2. I try to make sound "r" and simultanously I slightly hit many times palate with tongue (tongue needs to oscillate fast)

Well, it's a lot easier to me, I think, cause I'm from Poland, and in Polish language there is natural hard "r".

[KettleStrange]

I gave this a couple of tries, and it seems to work!
I just need to keep at it.  From your description I can feel when I don't 'mouth' something correctly and it comes out sounding like I'm gargling rocks.  Mmmm granite.
Thanks for your help!

[VathRas]

Nìsreng oeru prrte' lolu, Kiyevame ma Tsmuke