Pass #1: Translate as many words as you can on your own. Here are worksheets you can use:
Pass #2: Use your reader's edition to fill in the words that are used 30 times, or less, in the NT.
At this point, see if you can manage any sort of translation of these verses, even if it is only fragmentary.
What If I Don't Have a Reader's Edition GNT?
Click to see purchase options...OR you can download a reader's-style list of rare NT words for each verse here:
Pass #3: Go to StepBible and fill in all the remaining words.
Acts 2
36 ἀσφαλῶς οὖν γινωσκέτω πᾶς οἶκος Ἰσραὴλ ὅτι καὶ κύριον αὐτὸν καὶ χριστὸν ἐποίησεν ὁ θεός, τοῦτον τὸν Ἰησοῦν ὃν ὑμεῖς ἐσταυρώσατε.
37 Ἀκούσαντες δὲ κατενύγησαν τὴν καρδίαν, εἶπόν τε πρὸς τὸν Πέτρον καὶ τοὺς λοιποὺς ἀποστόλους· Τί ποιήσωμεν, ἄνδρες ἀδελφοί;
38 Πέτρος δὲ πρὸς αὐτούς· Μετανοήσατε, καὶ βαπτισθήτω ἕκαστος ὑμῶν ἐπὶ τῷ ὀνόματι Ἰησοῦ Χριστοῦ εἰς ἄφεσιν τῶν ἁμαρτιῶν ⸀ὑμῶν, καὶ λήμψεσθε τὴν δωρεὰν τοῦ ἁγίου πνεύματος·
39 ὑμῖν γάρ ἐστιν ἡ ἐπαγγελία καὶ τοῖς τέκνοις ὑμῶν καὶ πᾶσι τοῖς εἰς μακρὰν ὅσους ἂν προσκαλέσηται κύριος ὁ θεὸς ἡμῶν.
If you are not doing any handwriting, you can print out these worksheets and do your handwriting on them.
...to learn whatever you can from them.